The foundation brush I have now is from Studio and I got it at Walgreens at the retail price of $6.50. I bought that because I was impatient and wanted to see if using a real brush would help me. Well it really did help. I now get great coverage from my drugstore brand liquid foundation. Also didn't need a $32 brush from MAC. According to youtube I need several brushes to get the eyes, cheeks, and lips that I want. Today I ventured over to HauteLook for the first time and they have a set of 15 NYX brushes for $54(retail $99). According to Youtube and Makeupalley.com these are great quality brushes. Here is a little round up of what I am using for now as I sit and ponder a brush purchase.
Revlon PhotoReady Foundation: Goes on light and provides full coverage without looking made up. I personally use the Rich Ginger sade. It covers all my imperfections. The problem is that I still have some dry patches and it doesn't work so well and those areas. $13.99
MAC Blot Powder: I'm not really sure what this is doing or not doing for me the jury is still out. I bought this probably five years ago but I used it maybe three times a year.
Smashbox PhotoFinish Primer: I got this as free gift from Sephora. It provides a light silky base and seems to make my foundation last longer. However I need to find a more economical product when this sample runs out. $16-$49
Studio Foundation and Concealer Brush: This double sided beauty does the coverage trick. It can leave streaks at first but just keep blending until they disappear.