* I got my AxiDraw as an impulse buy for a Black Friday sale. They go on sale around then
* Search AliExpress for "AxiDraw". There are cheap clones for ~$130 shipped
* Thingiverse/etc have some DIY plotters in various form factors: Stationary like an AxiDraw, polargraph (hanging from two points vertically), little plotter vehicles that "feed" a paper through by rolling over it...
* Old 1970s/80s retail plotters (i.e. HP). These are sometimes more trouble than they're worth, both mechanically for repairs and software-wise. Serial port versions are more rare than HP-IB versions. The drawingbots Discord has good vintage info here
As someone who bought a ~$150 knockoff plotter, I wouldn't recommend them unless you're unsure and just dipping your toe into the hobby. The plot quality will suffer -- even small amounts of backlash or slop in the mechanism and pen carriage will result in irritating and unfixable offsets in finer detailed plots. The bigger issue is actually software support -- all the hobbyists shell out for the Axidraw, so it's the only well-supported unit on both an art-software-workflow side and plotter-driver-software side.
* I got my AxiDraw as an impulse buy for a Black Friday sale. They go on sale around then
* Search AliExpress for "AxiDraw". There are cheap clones for ~$130 shipped
* Thingiverse/etc have some DIY plotters in various form factors: Stationary like an AxiDraw, polargraph (hanging from two points vertically), little plotter vehicles that "feed" a paper through by rolling over it...
* Old 1970s/80s retail plotters (i.e. HP). These are sometimes more trouble than they're worth, both mechanically for repairs and software-wise. Serial port versions are more rare than HP-IB versions. The drawingbots Discord has good vintage info here