While at CES, I am doing reporting for
TabletPCBuzz as well as looking at products that are a good fit for our tablet PC customers. One of the items that I have seen online before is the Printstik Mobil Printer. Seeing it in person I am even more impressed by this small, compact printer.
There are two models available, one that can communicate wirelessly from your tablet pc using Bluetooth technology. This version retails for $299. The other version, which is a USB version is $199. I think that for $100 I would be fine with the USB version.

The Printstik is manufactured by Planon. It is a thermal printer that weight just 1 pound and 8 ounces. It feels very solid and is only an inch or so longer than the width of a piece of 8 1/2 x 11" paper. It has a Li-ion battery so no power cord is required for use in the field. With a resolution of up to 200x400 dpi, this printer is perfect for printing receipts or invoices.
You can print approx. 30 pages on a single battery charge and you'll get output of 3 pages per minute depending on the density. As will all thermal imaging printers, the "ink" will fade over time but this product is designed for printing in your car or truck so it is perfect for that kind of work.
You can get more information at www.planon.com.