Anton, I've bought my sole bends locally here in the USA before at Tandy leather, sometimes they don't have the thickness I need though. Some of their sole bends were from a tannery out of Mexico. Don't know about the quality compared to the "old world" UK or German stuff. You guys in Europe have a lot more access to certain stuff IMO; vice versa. It's practically impossible to walk in a store and buy lasts over here. Guy out of London can walk up the road, buy a set of shoe burnishing irons, Hirschkleber craft paste, French Saphir beeswax polish, and some hand carved wooden last all in the same trip. lol
At any rate, here's some links to what I usually buy so you can see some pictures.
http://www.theleatherguy.org/catalogsearch/result/?cat=0&q=sole+bend
http://www.theleatherguy.org/catalogsearch/result/?cat=0&q=shoulder
Remember you will need to take a flat faced hammer to compress the soles to make them last longer before you put them on. Take note of your grain orientation when you cut the soles out of the bend.
Happy shoe making