Deals Direct are very reliable, unfortunately they're no good if you want to sell on ebay because they also trade there themselves under a different name, used to be Australian Auctions, or something like that.
They do import a lot of new liquidated stock and distribute to the general public through their wholesale arm, Deals Direct, and then cut your throat if you try to compete online.
OO, again genuine, and while I have heard some say that they have prices that you can make money from on ebay, I have personally never any.
Of course I am only talking about selling on ebay, and other such online auction sites, but if they are your target market then wholesalers aren't the answer.
You will need to move into bulk, either new or liquidated stock. The best was of turning a profit on small buys is to stick with Secondhand in my opinion, much bigger mark up if you buy smart, and you can develop a regular customer base by offering a diverse range of items.