I need to know who the biggest mobile content resellers are
(ringtones, screensavers, java games, etc.) in the market that resell
their content either on an unlimited license basis or on a pay per
sale basis that can integrate into my existing website and billing
system.

There are a lot of content resellers who require you to use their
template websites and their billing systems, which is NOT what I am
looking for. I need to know the sources of content resellers who do
not require the reseller to use their billing system or their template
sites. I would also like to know how much they charge for their
content (ballpark) whether it is for an unlimited license or per use
license.

MMS3.com and mobilecontentcreators.com are the only two I know of but
there have to be others out there with extensive catalogues. or then
again, maybe not. I would like to know.

Thanks.

you can try http://www.mobilestreams.com/ 

Richard