Decided to install the MeCommerce widget. (It's free and they share profits 50% and you set the price)
I wanted to see the customizations. Whether you can change the colors to match your blog and to see if the size was adjustable as well.
These options are all available in the set-up interface. You can also edit them in the script as well.
The widget loaded extremely well and did not seem to slow down the page at all.

This may be a nice alternative to context ads such as Yahoo, MSN etc...

view live MeCommerce Badge here
GoodStorm (main)
MECommerce (main)