Dell xps15/xps13/precision 5520/5530? The xps15 and precision models have a 4 x 3.1 inch touchpad, the 13 inch might be smaller, I'm not sure. I don't know what it's made out of but it has a matte finish and is not going shiny with use. My experience with it has been very nice.

Edit: oh, you said affordable. I think the answer is probably "no" then, but macbooks are not cheap either. These dells are comparable in price to macbooks.