Hi Darcy,
I talked with Joe today at Sleepers Mattress in Ottawa (aka the waterbed gallery) and they are one of the Sleepers franchisees but they are independent and don’t offer the same Marshall and Springwall mattresses that are listed on the main Sleepers Mattresses sites and have their own component design (as you know).
I’ve included them in the Ottawa list here and when they list the current designs they offer on their website (which he thought would be about a month) he will call me and I will also list them in the online list for Canada as well.
Thanks for the heads up … and it’s great to see another good option for Canada 
NOTE added April 23, 2014: Their phone number is out of service and they appear to be out of business so I’ve removed them from the Ottawa list.
Phoenix