I use ammoseek.com though the first deal may sound good but once you add shipping it would add a few cents to the price per round. I usually pick a few and compare the shipping. I was looking at 7.62x39 steel 1k and from the cheapest price to one that was a little higher but shipping was cheaper I could save 6 bucks.
Any of the major factory brands will be fine for range ammo. Federal, Winchester, S&B, and many others will do nicely.