A couple places are: 1. Sprocket Specialists (cheap) 2. Sidewinder (expensive) remember, you get what you pay for

PS- I forgot to mention about the wheelie question... the hardest part to get used to is not letting off of the gas once the front end is in the air. It's natural for you to let off of the gas when you feel the front end come up, but if you let off completely the front end will go right back down, and that sounds like what you were explaining. You will probably need to let off the throttle a little but not much. In third, I usually gun it to pick the front end up then let off to about half throttle to hold it up. Keep trying and don't get hurt. good luck

 

if you can get the front up then all you need is practice, balancing is kind of a learned thing don't forget the brake just slide your foot over to the side case so when you painic you just have to push down