Currently you can buy Ntreev Points, CrimeCraft Gold Bars, WarpPortal Energy, G Coins, G1 Credit and 5$ Gift via Paypal
Needless is to say that with the PayPal gift you can buy currency for any game that allows paypal charge methods...which is pretty much all the online games out there...
MMOBomb is constantly working on trying to add new things to our shops...which leads to my last comment.
Instead of asking what you can or can not buy why don't you just check our Shop
and see for yourself?
It's right there in a pretty little tab for everyone to see... then the next step is to click the little tab that says Buy Stuff
on the menu to your left.