php ecommerce/shopping cart solution(s)?

[jsf]

It's time for me to start looking for an ecommerce/shopping cart/CC
processing solution for my employer.  MySQL/PHP is a requirement, FOSS
or inexpensive is preferred...

I'm looking now at http://www.ext-cart.com/  and I'm going to look at
OSCommerce (though I heard that it's being abandoned or something
recently on /. ... I'll have to check...)

Anyway... recommnedations apprecaited.

Cheers,

J.