Hm...
I wouldn't really prefer to purchase hosting via Ebay...I am not sure if they can provide you with any type of technical support...or anything...even if it's cheap...I wouldn't go with them...
Anyways, when you look at cheap hosting and reasonable priced hosting...it really depends upon the quality of the site and the testimonials...try webhosting talk sites...ask questions...do some reasearch
WebHostingTalk.Com is a nice site to discuss about hosting.