New usually $169, this one only used four times for $50 (and then sat in the corner of my room the rest of the time).

Portable amplifier that has battery pack so that you don't need to plug it in if you want to play outside or in the middle of large rooms.

Here is the CRATE description:
http://www.crateamps.com/dealers/bin_dealers.php?prodID=25&p=768&zip=94087&x=0&y=0

Here is the Amazon page:
http://www.amazon.com/dp/B0002E3EFM/?tag=googhydr-20&hvadid=10672559859&hvpos=1t1&hvexid=&hvnetw=g&hvrand=6785958281235990237&hvpone=&hvptwo=&hvqmt=e&ref=pd_sl_3iha6tz2sk_e