i work at a private motorcycle shop and somtimes we will offer to come check out used bikes for people for a small fee. if its a rotor, it should be easy to identify. i'd check out your local shops and see if they will do this for you.
5k is not a bad price, and i dont think your gonna find much cheaper vegas anywhere. i watched the salvage auction and they have to be pretty tore up to fall below 4k.
2007 Hammer S 100CI
S&S air cleaner, PCIII, SRVT clubs exhaust, Avon grips.
2006 Kingpin 100CI
stage 1, touring setup to come soon...nm bought a XC.
2013 Sunset red and black XC