Hi Dutch,
I also buy leather at Kobel Tannery, if you are ever in Hamburg or north of it. Give them a call and you can pick your leather from their storage. They also show you around if you like. If you don't mind a few blemishes, ask for their " Untersortiment Blankleder Hälse" , sort of half shoulder piece. They are their cheapest leather and great for small projects.
Suppliers: I never bought at these shops, yet
expensive, but hight quality
http://www.mehr-als-werkzeug.de/category/Leder--und-Papierwerkzeuge-3871_3822.htm;jsessionid=2003582E39BC85942CA489A2F3FE3633
http://www.sattlerbedarf-shop.de
http://www.rickert-werkzeug.de/de/Leder-Lederwerkzeuge
I buy here sometimes, because it is close to me. I prefer to look at the items I would like to buy
http://www.kappey.de/
Gesa