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'''Where to buy: ''' Belts can be often bought on Ebay. They are either advertised specifically for the Amstrad CPC but also those for Spectrum+3 will work. The correct belt is 3mm wide, 0.6mm thick and has a total length (outer circumference) of 230mm (often also advertised as 115mm). If there is no other source available, one could look on AliExpress for belt sets (3mm wide, 0.6mm thick) which contain between 50 and 100 belts of different sizes. Usually 2-4 will have the right diameter, but it's a bit of a gamble.