Why? The A720 is sold out and discontinued absolutely everywhere, unless you're willing to spend near 50% above MSRP (or hell, more) to get it.
I just got the last one on Crutchfield Outlet for $180, after Adorama couldn't get warranty service on my camera, and could only do a refund. (That's one hell of a tale in itself as well - needless to say, Adorama lost the $5k I am spending on lenses next month.) I am hoping it turns out well - most things sold through the Outlet side of Crutchfield turn out alright
All this said, the new Powershot lineup should be announced any day. Historically, this week has been the Powershot announcement week.