Ain't nothin' better suited to this one than some service or info to do with TradeMaRKs! TMRK a pretty nifty abbreviation for that.
It's also the Nasdaq letters for Terremark.com, a large company. Maybe they'd want their abbreviation?
Dunno about price, wide swing. You might get only high xx to low xxx for it from a domainer, or if a large end user becomes interested, into the x,xxx if you luck in. Without that large end user, I'd say $75 - 150 from a domainer, 300 - 500 average end user.