Ken, for round stock in short lengths, find a screw machine shop. They usually have a few tons of drops waiting for the recycler at any time. They are mainly a good source of round and hex stock up to about 3" diameter, (depends on how large their machines are). Most of the drops are about 5" long, as the self-chuckers can't feed anything much shorter than that and kicks it into the bin.
If you go to one of these shops, ask to see their oldest machine at work. The place I go for my scraps has 13 of these machines running 16 hours a day. The older ones are around 60 years old. Amazing machines. No computers. Just the old style ticker tape running a loop, and churning out an amazing diversity of round things, fast. Faucet heads, fire sprinklers, compressed air fittings, etc.
Good luck!
Dean