The retailer is allowed to sell an items for any price he wants but if he advertises the item it must be at MAP price or above.
This is especially true on Ebay and Amazon, the price must be at MAP or above or the Manufacturer will quit selling the item to the dealer.
Park Tool, Lizard Skin, Serfas, Planet Bike, Kryptonite and several other manufacturers have set MAP pricing rules. This is why you see every Park Tool Repair Stand on Ebay or Amazon are usually priced exactly the same.
Most of the MAP price agreements do not allow the retailer to put "make offer" in the listing.
How to Save Money on Park Tool etc.
You can email any of the sellers and ask if they will come down on the price. This will probably not work on items that cost under $40 as the shipping is high enough that there is not much margin. However the $200 to $500 items might be discounted if you ask.
Good luck in your Cycling Adventures
Enjoy the Ride,