The Tabletop Game Shop is a great family-run shop out of the US that specialises in acrylic and metal dice, and dice accessories.
TTGS has been running a Mystery Dice promotion for the last few weeks which finishes up tomorrow (end of Cyber Monday)
Mystery acrylic sets have been reduced to $3.95 from $19.95, and you choose from 20 random 'doors' (styles) of dice, so there's a lot on offer.
If you order 8 or more sets it's free shipping. Otherwise:
Insured International Shipping Prices:
1-3 Sets = $12.95 4-7 Sets = $7.95 8+ Sets = FREE SHIPPING!
I've bought a few things from these guys and they're always friendly, appreciative and have a very high quality product. There's a tonne of customer reviews and photos of the various dice sets as well if you want to take a look before you buy. May all your rolls be nat 20s!