Yes. At whatever Amiga dealer you prefer, look for the "Mr. Mysza" mouse adapter and the software that goes along with it. It's a relatively new product that allows Amigas to use any PS2 mouse or trackball.
I can't recommend Mr. Mysza enough. Probably one of the best (and cheapest) purchases I've made for my A1200T. Allows me to use a Logitech optical mouse in the standard Amiga mouse port so that it's completely usable with "Early Bootmenu" and old hardware banging games that bypass the OS.
Also I should note that my mouse is a USB mouse with a PS/2 adapter on it. :-)
