The [SRD](https://5thsrd.org/adventuring/equipment/mounts_and_vehicles/) (as well as the PHB and Saltmarsh) offers the following low-end water vehicles:

* Rowboat, a 10 foot vessel for 50gp.
* Keelboat, a 60 foot vessel for 3000gp.

There's a ridiculous gap between those two sizes & prices. What are some realistic medieval boats in that design space? Options in the ~200gp and ~800gp price ranges would be ideal.