Hi Hobotrader,
The Domfoam debacle led to some supply disruption in the Canadian market. The company was “split” as a result. I have talked to people who swore they will never do business with them again. Things appear to be back to normal again though based on conversations I have had with various manufacturers and retailers. You can see here that Eco-Latex is available through Dom Foam in a wide range of firmness levels. The chart is a great comparison between different methods of measuring firmness but the ILD column is out of whack compared to most other latex producers and seems to be based on incorrect “translations” rather than actual testing.
There are also ongoing lawsuits against some of the American polyfoam suppliers for price fixing on a massive scale (see here and here among many other articles about this on the internet).
That’s because almost all the dozens of latex manufacturers around the world make their latex cores in a 6" thickness (or close to that at least)
No … they’re not 
… although lots of people deal with them.
That’s because many Dunlop latex manufacturers don’t supply ILD’s for their Dunlop (see post #6 here) and sell it based on density with a “word” rating (soft, medium, firm). With Talalay latex manufacturers (both Latex international and Radium) its easier to find a closer ILD (although its still a range and not an exact number) because they are supplied by the manufacturer.
Phoenix