Best Buy offers the Line 6 POD Studio UX1 USB Guitar Recording Interface
with free shipping
. That's the lowest total price we could find by $34. Sales tax is added where applicable. It allows you to process and record an electric guitar directly to a computer and features 18 guitar amp models, 24 guitar cab models, five bass amp models, five bass cab models, 29 studio and stompbox effects, and 35 additional effect models.
Update: A reader notes that it's not fully compatible with Mac OS X 10.8 Mountain Lion; see this thread for more information.