[CompelTechnic]

Mr Money Mustache recently posted a writeup for a conversion for about $1000. I think you could do the same conversion for less if you source your kit and battery cheaper- these same kits sell for less on ebay.

http://www.mrmoneymustache.com/2016/05/25/recipe-for-a-badas...

[fludlight]

AliExpress (Alibaba for b2c) has a better selection and is generally cheaper than ebay but shipping is literally the slow boat from China.