At first, there was Pisobid.com then I found out about Happy2Bid on Ensogo.
I tried my luck last August 7 and I won my first bid for the Php500 Pizza Hut GC + 50 Bid Load.
Got total of 3 wins from Happy2Bid. The other two are Php 500 Mercury Drug GC + Buy 1 Take 1* and 15 bids load.
With these bidding sites, I make sure I don't get addicted. I don't push my luck when I feel like I'm bidding more than the amount that's on auction. I'm just doing this for fun. ;)
Why don't you try your luck, too. :)