I registered my own tartan sometime ago and was getting ready to have it woven when I was laid low by health problems and the ensuing costs...

As Steve said, I was looking at enough tartan to last me my lifetime (unless I decided to upholster all my furniture in it as well), which I am fine with. If your tartan isn't as exclusive as a personal tartan, your best bet is probably to get together a number of people that want some and order it all together.

If you're dead set on a small run, Matt Newsome at New House Highland has been known to do kilts in custom tartans, though I know he's not taking orders now while he catches-up on his queue. USA Kilts will also do custom-woven kilts, but they all appear to be eight-yard kilts.

It's not going to be cheap, but the group order is probably best as the more you order, the less you'll pay per metre!