The starting bid for 'ex hire' kilts off ebay is usually about £75. I was lucky enough to get one for that price in my (rare) clan tartan recently. It had seen a fair bit of wear and was probably over ten years old, but after a dry clean it came up like new (apart from the straps and waist lining, but I'll get these replaced at some time in the future). To buy a new kilt in this tartan (Hume ancient) would cost well over £300 today.