Here is my spare GK MB2-500 (one of the original US made ones, not the newer Chinese-made MB500). Light, powerful, unabused and in good nick. Bought second hand as a back up from the US, and converted to UK voltage (which just involves moving a jumper inside). Ungigged (by me) because my primary amp has never had any problems.
£320 plus shipping. Come with the original footswitch, and I'm sure I have a kettle lead for it somewhere.
18/03/12
Price drop to £300 shipped
5/08/12
[b]Price dropped to £275 shipped[/b]