Thanks Dedman, I've given Pablopepper a message.

Thanks Fretworn - Warmoth looks promising, but yeah, shipping is going to be the usual $30 US for 4-6 weeks, or $100 US for quicker. Ouch. Oh, and there's a $25 minimum order before shipping, so I'd have to get 2 sheets, and something else worth a few dollars... gah.

Pickguardplanet have a huge range of pre-cut stuff, but I couldn't see anything to just buy a sheet to cut your own. And some of those colour combinations... wow. They don't show any prices - you have to request a price, as everything is custom done.

Hopefully I can find a local plastic place that can sell me the sheets I need.