Kensington discontinues Iridio mice

yea what the heck. I am still using mice from like 1989 from a mac se. If you have to replace a mouse like ever, then its junk.

Back in the ADB days, my favorite was a Perfit, by Countour Design. It's made in many sizes. The new ones don't have a scroll wheel, but the company does make a 2-button scroll-wheel mouse (Unimouse), that may meet your needs:
http://www.contourdesign.com/unimouse-opt.htm

I think it only comes in one size.

Currently, I use a Kensington Studio Mouse, which (though small) works very well for my large hands. I had one die recently, after 18 months or so, and the company sent out a new one, no questions asked. Great service!

"It is, in other words, nearly a perfect mouse. Other than the fact that after about a year its USB bits die."

Other than the fact that it's complete garbage, it's great? You should get more than 1 year of use out of a mouse.

I'm with 18/Daniel on this one. My Yr2000 Microsoft Optical IntelliMouse is going strong after 6 years - no cleaning required, comfortable in the hand unlike any Apple mouse, no drivers required for 4 button operation etc etc

Macally has a great tiny, no-frills mouse I've been using for years called the iOpti Jr. That's what it was called when I bought mine six years ago, anyway. It's since been rebranded as the iceMouseJR but I assume that the quality is the same:

http://www.macally.com/spec/usb/input_device/icemousejr.html

Erica - I actually have an Iridio that I purchased about 6 months ago and have never used. After receiving it I found that it was just too small for me and it's been sitting in a box since then. If you'd like it feel free to email me at the gmail address I've entered in this comment and I'd be happy to send it to you.

I second the Logitech Notebook Optical Mouse Plus. I lost my first one, but I liked it so much I bought two more. Found them at Fry's for about $20.

http://www.logitech.com/index.cfm/products/details/US/EN,CRID=2146,CONTENTID=8142

i dont know if that will help

but here in Egypt there is a lot of cheap chinese ripoffs of this mouse
same shape, size nad colour

I'm not sure what you mean by "USB bits going bad" but I'm willing to bet that the mouse is dying because a part is failing. I'm sure you have a few friends who are handy with electronics, why not let one of them take a stab at identifying the failing component and replacing it with a simple and cheap order from digikey. Thy may even be able to revive your other three, assuming you keep broken mice.

The Logitech V150 and V450 are both small laser mice -- the 150 is corded, the 450 is cordless. I really wish they made a laser version of the V200/V270 series...

V150
http://www.logitech.com/index.cfm/products/details/FR/EN,CRID=2146,CONTENTID=11637

V450
http://www.logitech.com/index.cfm/products/details/FR/EN,CRID=2146,CONTENTID=12004