The company also sells through eBay. There's one on eBay right now:
http://cgi.ebay.co.uk/TOTO-TOTO-IV-Original-LP-Vinyl-Platinum-Disc_W0QQitemZ110258971335

I also bought TRAVELING WILBURYS "VOLUME 1" but I sent it back because the LP wasn't in the best of condition, and any imperfections are highlighted by the platinum or gold electroplating.

They also do a custom service, any layout you want, and you can send them your own LP to electroplate. This is probably the best way as at least you know what condition the LP will be in if it's your own LP!

I had the CRAZY idea of sending off my whole Toto LP collection to be plated, but
I think I would need a bigger wall and a MUCH BIGGER credit card!

I really wish the Falling In Between album had been released on vinyl. That one would definitely be getting the platinum plating treatment!....

PS - Beware of fake versions like this one on eBay:
http://cgi.ebay.co.uk/TOTO-LTD-EDITION-CD-GOLD-DISC-TOTO-IV_W0QQitemZ300202611768
It's just a generic LP mould, with the CD placed in the centre. I guess the good thing about this one is that the vinyl will always be in perfect condition, but I'd personally rather have the real thang!....