Bitmain are probably the only reliable site. But their delivery times are questionable. You can check the hardware sub forum here on the forum and use an escrow to assure everything goes smooth.
Presale is made by the bitmain site only bro. I am not sure whether the closed the order or not. However you can make the order from the eBay resellers please check the trusted trader who made many sellimgs previously by checking his trade account. If all find place the order with that person. Your amount will be safe.
Only thing to worry is cost will be double the time higher than the value you find in the reselling sites.