Canon Underwater Camera Enclosures on sale

I came across this on SlickDeals today, Canon is running a sale on some of their camera enclosures for as little as $89.  That's a significant discount from regular price.  If you have a Canon camera, it might be worth checking out their site to see if the one that you would need is on sale. 
http://www.usa.canon.com/cusa/consumer/standard_display/underwater_photo
Here's the list of models that are on sale.
    * WP-DC21 (Compatible with Canon PowerShot G9)
    * WP-DC19 (Compatible with Canon PowerShot SD950 IS)
    * WP-DC7 (Compatible with Canon PowerShot SD 900)
    * DC17 (Compatible with Canon PowerShot SD870 IS)
    * WP-DC23 (Compatible with Canon PowerShot SD770 IS)
    * WP-DC13 (Compatible with Canon PowerShot SD1000)
    * WP-DC14 (Compatible with Canon PowerShot SD750)
--AJ