This is an old post, preserved for reference.
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If you've got a VIC20 or a Commodore 64 and you want a simple disk drive replacement, the solution is fairly straight forward, you get an SD2IEC.
The Future Was 8 bit, in a variety of shades to suit a range of Commodore machines.
VIC20 Penultimate Cartridge, which can automatically start the file browser from its menu.
the SD2IEC Classic V1.0) are similar to those used inside the normal SD2IEC units, but without the buttons. There are additional contacts at the edge of the board to fit buttons and duplicates of the onboard LEDs.
Update: an internal SD2IEC for a C64C.