Looking for fast business card size printer that will print duplex.

[cjones47421]

I am looking for a monocrome printer that will print on both sides of a stack of paper business cards and do at least 1 card per 5 seconds and cost less than $1000. Before anyone says, just print on perforated cards and tear them apart. This is for clients who will not want to mess with that. Currently what we have included with our application suite is a plastic card printer costing $2700. While it is nice it costs more than the rest of the package combined, so I am trying to lower the cost.