I got it from Thumper Racing. Go to there web site,,theres a 800# you can call. I set up an account with them so I could get the stuff at dealer cost,,,so I dont know what it'd cost average bob or joe. I work for a motorcycle perf shop. I can tell you this,, the piston,sleeve,gaskets,clutch plates&springs,cams (intake&exhaust) will you cost you less than half the price of these other big bore kits I'm seeing (Yosh,Trinity,CT) and thats the average Joe price. Keep in mind,,you still have to pay someone to bore the cylinder ($120) and install the kit. If you are in any way mechanically inclined and have a decent work area,,,do it yourself,,,just get the service book from Alba racing and go at it. Its VERY easy. No trick tools needed. Let me know if you want a kit,,,I'll go through the invoice and put together a price that'll satisfy. Keep in mind,,the cheapest kit I've seen was CT I think and it was around $1400.