It's in the rules... sort of.
No advertising for your monetary gain. We make no profit from this site and we won't help you make it either.
When you break it down to brass tacks, we don't make a profit here and we won't help anyone else make one either. Hence, it goes both ways: no offering to sell things and no offering to buy them.
ETA: Also, moved to the Sims 3 section. All requests for TS3 need to go here.