This is a continuance of the inflation post, since people asked for something. Feel free to use it, adjust it, etc.
Situation Fame Cost Adjustment
PCs are just starting out Unknown 0%
PCs got trashed, some died Big Gossip Item -10%
PCs were mildly successful Minor Gossip 0% to +5%
PCs were successful but some died Popular Gossip 0% to +5%
PCs were successful, all returned Popular Gossip 0% to +10%
PCs were very successful Famous +5% to +15%
PCs accomplished major feat Famous +10% to +25%
PCs are Big Damn Heroes Very Famous +25% to +200%
In all cases, if PCs saved town or a particular business they buy at, prices drop from 10% to 100%, as a reward.