Looking for 45's LP advice?

I have a bunch (+200) 45 lp's that I received after my grandmother ped away. I have no need for them and they are from the late 30's - 70's of all genres. Big band, Peggy Lee, some rock and roll ones, too. I would like to know of a good source to talk to to get these catergorized. I don't want to just go to a record store and get $0.10 each. Anyone know of a reputable appraiser I can contact?