Have you done any research on Excalibur, Gayle? If you Google “Excalibur Melodica” or “Excalibur Accordion” you’ll find people saying that they are a rip-off and some saying that they are repackaging cheap instruments and making questionable claims about where these instruments are manufactured. I don’t really know, but I would proceed with caution.
For example: http://www.complaintsboard.com/complaints/excalibur-37-note-pro-artist-series-melodica-black-wisconsin-c381891.html
I’m surprised to hear you say that your Hammond 44 is fragile.