Check your local Academy. They're very hit or miss, but seem to have ok prices (as they go). Try 10 Ring (off of 290). They're showing up at gun shows now, but you have to deal with those gypsies.
You didn't mention price. You might want to take your favorite antacid along with you. Typical price is $100-$125 per 1000. Jump all over any you find at less than that. Based on inflation and what they were selling for a couple years ago, they should be around $60-$65. The very best price I've heard this year was in the low $80s.
Small rifle and small pistol seem to be the hardest to find.
You can use magnum primers in place of regular primers, so don't let that keep you from getting primers.
I picked up 1K of SPPs at the last Pasadena Gun Show - for $100. If you look on Texas Gun Trader, you can usually find a few - at scalper's prices. There is one guy who gets the Argentine SPPs in, and sells them for about $80 per K.