....or you can ask Santa...
There are other websites that promote such things. You could try latestcasinobonuses.com among others. Try a Google search for no deposit bingo.
Many bingo sites gives no-deposits, but you can't withdraw from most of them AFAIK .
I succesfully withdrew at Bet365 Bingo though . Lucky me, I was there at the first week with not much players and great odds .