They are US distributors so I don't know if it helps but here's my #1 and #2 sources for it in sheets and rolls:
www.pictureline.com - Prices are always competitive, competent sales staff, good communications
www.uniquephoto.com - decent prices, big selection, watchout for backorders... they don't warn you with net orders
I don't know if they ship overseas or if that's even reasonable in terms of cost.
Smooth Pearl is my primary paper and the only alternative I have is Epson Premium Semi-Gloss.
Chip