Does anyone here know know roughly what the wholesale prices for Fender Amps are that stores pay?

Specifically I'm looking for the whoelsale price of a Fender Blues Jr (retails for between 400-500$) as i'm about to go haggle with a store manager for a while about purchasing one. It's always a good idea to find out what they pay for one so you can set your price accordingly.

Thanks for any help.