I've like the Logitech Performance Mouse MX. I've got two. It's pretty much the complete opposite of what you're asking for, Doug: it's got more than two buttons and it definitely doesn't cost $10.

On the other hand, you've already found a replacement, so I'll just throw it out there for others. It's a good size; I find it comfortable; I sometimes find the continuous scroll that Tom mentioned useful. I particularly like Logitech's unified receiver: one (tiny) receiver can deal with up to 5 peripherals (although why you'd have more than one mouse, one keyboard escapes me).

On the subject of keyboards, I like the Logitech K800. Again, I've got two of them. It lights up when you wave your hand near it; that's all you need to know.