I was looking into this also for a while. There are many amp kits available over here from places like Jaycar, so I imagine there would be similar stores across the globe. But... Then I realised that most of the options available simply use an Aker amp and (for the FOTK bucket) small rectangular laptop speakers. Both of which can be purchased quite cheaply. The only issue I had was feedback due to the proximity of the microphone to the speakers. Despite this I achieved quite an authentic sound, I just need to work on my accent