Ever think of building one yourself? Guitar cabs aren't too difficult and a good wood supplier and average woodworking skills are all that's required. Most of the little extras (handles, corners etc.) are easily obtained on line. For a quick intro, check out Celestion's web site. Find a cab you like the sound of and measure the interior volume and build yours to the same volume, or just experiment. This works for guitar cabs: bass and PA cabs are a different and much more complicated story.
Most guitar speaker spec sheets have a recommended minimum enclosure volume and that's a good starting point if you aren't copying a favourite cabinet.
Not Canadian, but I thought I'd add JDesigns cabs out of California. Just got an unloaded 112 from them last month and it is great. The workmanship is real nice and the price was fair. Service from the owner Jeff Earl was spot on too.
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