Coincidentally, I was thinking last night I should grab a few replacements before I need them. Checked the local instrument store and saw they were selling a BSP "bundle" which came with a bunch of patch cables in a nice looking Arturia bag, but no extra DIN->TRS cables. Looked up on ebay and found a place called Seaweed Sound who are selling them, though the cost of shipping to Oz is more than the cables: $10au per cable + $19au shipping. I'd need to grab 4 of them to make the shipping anywhere close to reasonable ($5 is still ridiculous). But it's looking like I'll have to go with that option as nobody local seems to have them and I don't want to make my own.
UNLESS, Arturia start making a cable kit.