I bought one of these leather straps and a linen cloth from ebay.

Here is the sellers I found and can be useful for others:
Linen:
Toners Blenders, Riley Blake items in Totally Patched store on eBay!
Oirental arts, washi origami items in Oriental-Direct store on eBay!
eBay My World - vilenda
pencil pleats, pencil pleat items in poppie 1956 store on eBay!

Leather:
leather belt, sheath items in leather sheath store on eBay!
Bags Accessories, Manduka towel items in silkmanor store on eBay!
Hardware, Special Offers items in cqr-products.sales store on eBay!