I've spoken in the past with Rocky at USAK about getting Buchanan Modern in stock and he's told me that there doesn't seem to be enough general demand for such a loud tartan. I believe he also gets his PV material from Marton Mills which doesn't seem to produce Buchanan Mod in PV to begin with. The Buchanan Ancient is a wonderful tartan though! I have a PV kilt in that style which I ordered from ScotWeb a while back, also from MM I believe.