People can post dollars$, dollars$$, dollars$$$ to represent $100, $200, $300, etc. Probably some room to fine tune the keyword.

Then that word can be searched and show up, without needing to be sectioned, or placed in the title additionally. I'd leave out the "dollars" part if the board doesn't have minimum search lengths, except then it would probably pop on all $ hits for the $100 range.

Not a perfect system but it would make it possible to self-categorize a little. GBP would complicate it.