eBay - seems like some of the cars are bargains there. Some go for silly prices, too. It seems like the in-between quality cars seem to go for the most money, relative to my perception of their value. The really nice ones seem to not fetch quite what they should.

Parts for the old cars are no longer in local shops (with exceptions) but the internet and modern package delivery puts practically any part you'd need on your doorstep within a few days - maybe a week if shipping from Sweden. And they aren't even priced horribly either.

They are good cars to learn wrenching on - pretty easy to work on, simple, tough, and not built in a way as to overwhelm you with problems (like an Italian or British old car can sometimes do).
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I'm JohnMc, and I approved this message.