if you want some quality ones check out Husky at Home Depot, they don't break the bank and are the same castings as Blackhawks which many regard as the best.
I have Husky, Blackhawks and Gearwrench, with also a set of Armstrongs en-route. I really like the Blackhawks a lot, waiting for the Armstrongs to get here to give them a try.
Also, bear in mind not all makes seem to have all sizes so you may need to take that into consideration when purchasing. My Huskys are 10, 12, 13, 14, 15, 17, 19, where as my 8 piece GW kit is 10, 11, 12, 13, 14, 15, 17, 19.