I remember going to the junkyards after school and finding them littered with old Coronas, Carinas, 810s, and Colts. Now a decade and a half later, they're barely in scrap piles let alone rolling down the road. Finding such a period correct example of Japanese-American iron that hasn't become either part of the landscape or someones drift muse is indeed a rarity. Find this 1978 Datsun 810 Wagon for sale in Marietta, GA for $5,900 via craigslist. 
The original Datsun 510 Bluebird was sold in the US market from 1968 through 1973 on a well engineered compact unibody platform that used MacPherson strut suspension up from and semi-trailing arms out back. Power came from a SOHC 4-banger that was basically Nissan's 240Z engine with two cylinders lopped off, but today's 510 is powered by one of those spinning cam-less/piston-less freaks of nature from Mazda. Find this 1972 Datsun 510 with Mazda 13B offered for $12,000 in Los Angeles, CA via craigslist.
The Datsun 510/Bluebird was a small sedan (2-door, 4-door, or wagon) built in Japan and sold from 1968 through 1973. Their boxy good looks have stood the test of time better than most other
Datsuns from the same time period, and if you like the 510 sedan's
style you'll dig this next feature. Find this 1971 Datsun 510 Sedan with KA24DE power offered for $8,500 in Palm Springs, CA via craigslist. 
In 1968, with the release of the 510 series Bluebird, Nissan put together a winning formula of Teruo Uchino styling, bullet proof inline-4 cylinder engine, rear-wheel-drive, and IRS. The little coupe/sedan/wagon was badged as the 510 for the US market and offers a surprisingly compelling alternative to a BMW 2002. Find this 1971 Datsun 510 Bluebird 2-Door here on eBay
currently bidding for $12,600 reserve-not-met with 2 days to go, located in sunny San Diego, CA.
The Datsun 510 was part of the Nissan Bluebird lineup sold in the US market from 1968 through 1973. The sheet metal was penned by Datsun in-house designer Teruo Uchino and the suspension was cribbed from the BMW 1600/2000/2002 -- MacPherson strut in front and semi-trailing arms in the back. It was the poor man's BMW when new and given the recent run up in BMW 2002 prices, that name rings true today. Find this 1972 Datsun 510 2-Door offered for $8,500 in Rochester, NY via craigslist. Tip from Sam. 
Sometimes a picture says a thousand words and other times it asks a thousand questions...this is one of the latter times. This 1991 Nissan Stanza XE is offered for $1,600 in Lancaster, CA via craigslist by a shoeless dude who stares forlornly at his soon to be ex-car. 
The Datsun 510 (known as the Bluebird outside the US & Canada) was
the Japanese equivalent of the BMW 2002 from parent company Nissan.
Like the 2002, they were built by the boatload, rusted instantly when
exposed to moisture and languished in a price range that put them just
inches from the crusher for decades. However, recently they have seen some price appreciation and even versions with unoriginal power-trains see some love. Find this 1972 Datsun 510 Sedan with F20C engine offered for $21,00 in Irvine, CA via craigslist. Tip from Brian.
The Datsun 510 has for years been considered the "poor man's" BMW 2002, but the 510 prices have risen recently, particularly the sporty looking two-door version. Today's example is not a original-condition low-mile survivor and has does have some rust, but the price is good and recent work done almost exceeds the asking price. Find this 1972 Datsun 510 Bluebird 2-Door offered for $5,000 in San Jose, CA via craigslist. Tip from Kaibeezy.
The Datsun 510 is a classic of the compact, lightweight RWD Japanese car formula from the 1970s. Their boxy good looks have stood the test of time better than most other Datsuns from the same time period, especially compared to the awkward B-210 (even when there are no clouds, it isn't sunny anywhere near a B-210). Find this 1972 Datsun 510 Bluebird with KA24DE power for sale in Hickory, NC for $6,500 via zcartrader.com. Tip from Tony
The Datsun 510 Bluebird was produced from 1968-1973 and sold in the US market as the poor man's BMW 2002. Prices for running/driving 510s are certainly less than the $30k price tags we've seen on unimpressive 2002s. The idea of a $30k 510 is mostly preposterous (ditto on the 2002...) but sometimes a seller puts so much money in modifications into a car that he can ask ridiculous amounts of money. Find this 1971 Datsun 510 SSS Bluebird for sale in Redmond, WA currently bidding for $16,100 reserve-not-met with buy it now of $30,000 via eBay.
The Honda F20C engine from an AP1 S2000 is a modern marvel in mass production internal combustion engines. It employed an array of bespoke racing technology to obliterate similar sized naturally aspirated engines in power density and is known to last well into the 200k miles with minimal issues. The S2000 roadsters have dropped to a price point where a good crash will cause the car to get parted out, allowing all manner of plasma torch wielding mad scientists to use their greasy bits for transplants. Find this 1972 Datsun 510 w/F20C and 6-spd for sale in Raleigh, NC currently bidding on ebay for $8,000 with a 4 days to go.
The Nissan Bluebird was sold as the Datsun 510 from 1968 to 1973 and has a reputation as a poor man's BMW 2002. Equipped with a stock engine and suspension, the 510 isn't thrilling to drive, but bolt on some go-fast goodies and the 2200 lb chassis comes alive. Find this 1972 Datsun 510 with SR20DET engine partially installed, currently bidding on ebay for $5,300 with 4 days to go and located in Frisco, TX.