www.dotregister.com has a similar service to snapdomains and I believe it is cheaper too (depending on how many credits you prebuy). It is based on "credits" and the more credits you buy the cheaper it is. So it is $20 - $6.50 to monitor the domain for 1 year. then 4 credits once it is registered with that. (4 * $20 - $6.50).
ZoiNk