I have a site and I'd like to purchase about 20 type-o domains for it. After I purchase the domains, I plan on testing them for few days, to see which ones of the type-o domains get traffic. I'm planning to keep the domains which provide traffic, and refund the ones that don't. My question is which domain registar should I use to do this. I currently use namecheap, however they charge your 1$ or 2$ for every refund you make. Which domain registar should I use in order to make this happen, are there any domain registars that don't charge per every refund.