Ringfo!

Neat little hack of the Amazon API from ringfo that let's you call in a upc and recive info from a standard telephone number.

(from the site)

1. Dial 1-617-712-3574
2. Find the bar code on any product (also called UPC or ISBN)
3. Using your phone keypad, enter the numbers found below your product's bar code
4. Listen for new and used prices, customer ratings, and similar items

The number seemed to work beautifully with my copy of "The very best of Motörhead" and if you log-in via the site, it will keep all of you searches saved.