[Inkscape-user] Cutter recommendations?

Any recommendations for those paper / card cutters that can be driven by Inkscape / an Ubuntu environment? Cricut and CraftRobo are a couple of brands.

We're using Inkscape to design and print buttons, the round mylar coated things you pin to your shirt, it works very well, clones and clones of clones make it easy to control the number of each design printed per sheet. We have a manual circle cutting device but aligning it with the accuracy required is a pain, and it only cuts 1-3 circles at a time (for more than one you stack pages, but that creates alignment issues too).

So the immediate use for a cutter would be simply cutting 12 circles in a sheet of regular weight paper, but something more versatile would be good.

Thanks, Terry