Hi Jeff, I did some local research for the Australian scene following your suggestion?and found these boards that might be suitable as the base for T-TRAK Modules: Prices are in Australian Dollars.
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Product Code : DB1042 $10.00 Art Canvas, 30x40cm, 4cm
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Artist Canvas Panel 3pk. 30 x 30 x 2.5cm. 1.7 Thickness, Product Code: DG1314 $20.00
My Choice (because of the materials):
Wood Artist Canvas, 40x30cm Product Code: DG857 $12.00?
[NOTE: ALL WOOD no canvas, "Wood Artist Canvas" is the brand name]
"100% Australian owned and operated, Cheap as Chips started in 1985 with a store in Morphett Vale South Australia and have since grown into a company with 40+ stores, creating local jobs in regional and metropolitan SA, VIC & NSW. You can see our?full list of stores and their locations?."
As well as ordering just about anything through their Online store. They have a good selection of Art canvas but the other packs don't fit within the standard T-TRAK Module range eg Oval, too wide, not wide enough.
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Ian