SandraC - Hi!
I got the Swan for $69. for our upcoming weekend in May!!!!
As far as Canadians getting this rate, I don't remember any restrictions - you just plug in your name, address, credit card, etc. and they either accept your bid or not.
There is no guarantee you will get Swan/Dolphin and you do run the risk of getting priceline's other resort hotels (DT Hilton, Marriott World Congress, and a couple more) but I figured at that price it wouldn't be so bad.
I can't wait to try the Heavenly beds! Hope they rival the Four Seasons Vancouver which currently has the best hotel beds IMHO!