On eBay ‘webuybooks' are often much better described in regard to quality, I've had nice quality games (clean and good condition). If there is any minor disc scratches/marks they do state that so we know before purchasing. Their pricing sometimes changes so at times you can get a great deal if your lucky and grab it before someone else does (similar to MM). They don't hold as many games as MM do and won't always beat their price but they have been reliable in my experience

While neither are perfect, and Momox items are posted from Germany, in my experience the following are more reliable:

WorldofBooks
Momox