If you are posting in the bridge forum I'm assuming you have the full version of Ableton so paying for loops in my opinion is a waste of money when you have a DAW like Ableton. What you really need is some virtual instruments and effects to make your own loops unless you don't want to put the extra time into making your own stuff but personally I've found that you have to do that if you want to sound different than every other DJ that can just buy/download loops as well.

Worth paying for loops = Vengeance sound packs - or anything by FXPansion.
There's an interesting Deadmau5 video on youtube where he states FXPansion had a major input into his tracks.