Have a look at EBAY. I bought it from there. The Marathon type is what we want. Watch out, most come only with on-off foot pedal, you have to search for one with the speed control. Speed control is still there, the rpm has only to be pre-selected on the power supply. The collects accept 3/32 (2.35 mm) bits, for the 1/16 shanks an additional bit is needed. If you want to use it for drilling, you have to buy a drill-bit set with 3/32 shank. Milling bits (for carving) are nearly extensively 3/32 size anyhow.
Good luck
János