I've always purchased my gear off of Amazon. It's inexpensive, and you can actually get good quality gear. You don't need custom-made stuff. I never had anything custom for my first SD.

I had to fundraise for the mobility harness I'm having made for my current boy - custom harnesses are expensive! - and I didn't even start the fundraiser until I was positive he was going to finish the training. If I didn't need it, I'd still use the $20 Amazon harness we've been using for the past year. It fits him, it's cute, and it gets the point across. I've never had anyone question it.