http://www.zebrapen.com/products/pen/v-301-fountain-pen
I found some at the local Office Depot this afternoon, much to my surprise, red-tagged at $3.03 each, in black only. I grabbed a two just out of curiosity, and so I'd have more than two cartridges to refill. It appears to use a fibrous-wick-type feed similar to the Pilot Varsity/Vpen, started in a reasonably short time after it was inked, and lays down a fairly wet line somewhere around a Japanese M. Surprisingly, the cheesy looking nib is tipped, and tolerably smooth.
The cartridge looks like an oversized short international, and the barrel has a stop down inside to hold the cartridge firmly onto the back of the section. The pen caps and uncaps snugly, and the barrel makes a very nice whistle when blown through.
For three bucks I certainly won't complain.