Marc is spot-on -- you will have to dig just as with any other source to find the serious deals. Conversely, I would point out that anything selling for 25% under the average price on Amazon is actually a pretty good deal (although from experience I would stay out of crap offbrand watches that no one wants, which is why they have a $400 MSRP and $45 eBay price in the first place.
The days of finding "wholesale prices" that you can mark up 100% or more on an item that anyone in the first world actually wants to buy, and
the deal not being a one-time thing you won't be able to repeat once you sell out, are long over. Most retailers who have millions, tens of millions, billions to spend on inventory, a huge warehouse and shipping infrastructure, and bottomless advertising budgets aren't getting high-demand new merchandise for much more than 20-30% markup (outside of clothes, cosmetics, and furniture, all of which have huge markups for various legitimate reasons, and -- notably -- all of which can be bought for pennies on the dollar at the liquidation level, new in the wrappers, unlike higher-demand stuff.) You want huge markup stuff that will also sell, you have to be prepared to really dig for it, and
start looking for your next item as soon as you find it, because market dictates it will not last at that price.