Amazon and Acme Tools are where I recently bought tracks and track accessories for my Mafell jigsaw.
Got the 2x52" track set from Amazon on a Black Friday sale, and then the end of 2024 Bosch was running a "Spend $x, get $y off" deal that capped at $150/$30 on Amazon, but was progressive (150/30, 300/75, etc) at Acme. Acme's selection wasn't as big as Amazon's (I couldn't get holey rails), but Amazon wasn't running the progressive sale and I was looking around $350 in accessories, so I went with Amazon.
I have an Acme Tools locally, but they don't carry much in store. I ordered online and had reasonably quick shipping and know that I can go to the local store to return if I have any issues.