HQ RealFeel 6" sells for around $40, if i'm not wrong. Realfeel pads are double sided, one feels like a regular drumhead, the other is made of Neoprene and is supposed to build strength.
I use a RealFeel 12", bought it for around $45 after discount at Yamaha. I would say the 12" is a better buy, if you don't carry it around that often. (Cuz it's quite bulky and heavy due to its size), and yu also get a wider playing area.