Monoprice has their mini 5-watt guitar amplifier on sale for $13.99 + shipping.
It appears to be their own labeled version of one that sells on Amazon under several brands for $25 or so.
In addition to being a portable amp, it can also record to a microSD card and supports aux input as well.
These little amps are handy when traveling, or practicing in the car over lunch, etc.
If you pad the order to $25 with cables and such, coupon code 5GAME will take $5 off $25.