Another option is building your own, if you are handy and feel confident (or, have a woodworker friend who would help?). Musicmakers and Markwood both offer a kit... the 26-string Musicmakers Limerick and the 22-string Cambria kit.
(Is it okay to post links to the site?)
Here's the Limerick:
https://www.harpkit.com/limerick-lap-harps.htmlAnd the Cambria kits page:
http://markwoodstrings.com/cambria/the- ... harp-kits/It seems Musicmakers have changed their offerings since the last time I looked, but perhaps they still have videos that also help with the build.