Ebay seller the_world_of_fabrics has double-width poly viscose tartan in a few different setts (nothing exotic - Black Watch, Royal Stewart, Thompson Caramel, and some fashion setts) for GBP 3.99/meter. They do describe as lightweight, but mention kiltmaking as a possible use. In my case I had a backup use in mind in case it turned out to be too light, so I took the plunge and bought some Black Watch sight unseen.

It arrived today and I have to say, it is too light to be suitable for kiltmaking. If I had to guess I'd say the weight is 8oz, compared to the 11ish ounce Marton Mills PV I've handled.

It's nice fabric, though, and will make a nice table covering and/or backdrop when vending at shows. I may also make a full length, bias cut waistcoat out of some of it. So, nice tartan fabric at a good price (even factoring in overseas shipping, I don't think you're going to find PV tartan for much less in the US) but too light (in my limited experience/opinion) for kilts.