The tricky thing about sourcing the parts is the pipe. Most are made by rolling the steel and welding it, which often leaves a seam on the inside. Depending on the clearance between the pipe and the auger, this might make it impossible for the auger to fit. Even it the auger does fit, it's best to have a smooth surface inside.
I don't know how it would be in Europe, but in my city at least all pipe from the hardware stores have the seam, except for brass pipe. The company Tim orders the pipe from has several warehouses around the country. When I order the same part number he does, I get a pipe with a seam, while the pipe he gets is smooth inside.