Here is a store that has lots of tools and surplus tools, MANY of which are American-made. Specials regularly come up and they have a few 3/8" socket sets that are of decent quality. It's a nice web site to leisurely look through.
OTOH, you can still find your Craftsman sets (at Sears, or other places) that are decent quality (if you look hard), but soon they will all be Chinese, albeit with the lifetime warranty. Horror Freight will sell you a socket set (and I've had some from there, too), but I wouldn't recommend them for hard use. I use them where there is a chance that they might get stolen and it's no big loss to replace.