IWell you should ask to buy another keyboard in the Marketplace forum, but in the Hardware Issues forum let me ask if you have tried cleaning the keyboard? Compressed air will push light junk out between the keys but you can remove the key caps with two paper clips (see below) and remove real gunk with alcohol on a Q-tip. Disassembling the keyboard to clean underneath is not too complex, but keep track of all the tiny screws. You will get to a PCB board where the contacts look like black blobs. Clean any gunk here with alcohol. Then using a rubber based eraser, rub each black dot well, re-clean with alcohol and reassemble.
Key cap removers: you need 4 hooks to grab the key cap and pull it safely off (prying it with a small screw driver can work but damage the cap); straighten two paper clips to make a pair of straight wires; bind both into equal appearing "U's" and using needle-nose pliers bind small hooks at the very end of each of the U-shaped wires to give 4 hooks. Place the hooks on both sides of a key cap and pull straight up. This will work the same as a (impossible to find) cap removal tool.
Any big box Amiga keyboard will replace another although you may need a cheap adapter. Amigakit sells a PC-style keyboard adapter if you have a PC keyboard you like. I like the old Clickity large heavy IBM keyboards myself.
