Do you mean
www.amigakit.com? I think anybody who has dealt with Amigakit would thoroughly recommend them.
You should invest in a Cocolino adapter. It costs about the same as an Amiga mouse, but lets you use any PS/2 mouse on your Amiga. Which means when your mouse wears out or breaks, you can buy any cheapo mouse to replace it, instead of hunting for an Amiga compatible one :-)
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moto