Does Anyone know how to find out what cost a retailer pays for a particular product?

Question

This is to help me bargain, the items are:
Hartke 4.5XL
Hartke 3500A

These are componets of a bass amplifyer,
Thanks for anyone that can help!
This Retailer is Sam Ash
( i want to trade in an amp i have and want to be able to bargain the best way possible)

Answer 1

Not likely, many wholesalers have different prices based on the number of items purchased!
Wholesale prices will vary greatly from day to day and country to country.