I use a ebay seller called window_box, aka Blackdagger Games. They are based in the US Southeast. They combine shipping, you pay $2.80 for every bit listing you buy, so you can save a bundle on shipping. They do ship internationally for a slightly higher rate. They have an excellent bit selection, and I use them whenever I want a custom figure. (My entire Space Wolves GH and BC squads are pieced together from their ebay store.) Prices are pretty good, considering they usually stock hard to find bitz. They do not carry any pewter bits or kits that contain pewter.
"Take a moment, please. Ponder the depths of your insignificance."
"It would be disappointing if you were unable to overcome this simplest of defenses. Hilarious, but disappointing."
Crimson Fists (C:SM)
WARMAHORDES (Skorne, Blindwater Congregation, Retribution of Scyrah)
DROPZONE COMMANDER (PHR)