I meant to post this earlier, but the Metamorphosis Alpha module The House on the Hill is on sale until the end of Jan. I believe it's the first and only module ever published for MA. It's an introductory module that expands on the RHDU (Round House Dwelling Unit) from page 27 of the original rulebook. It's by Craig J. Brain (who runs metamorphosisalpha.net and works with Jim) with some material by Jim Ward.

Craig wrote this on OD&D Discussion two weeks ago:

so to accompany the [Print-on-Demand of the] rules, I've dropped the price of the print version of Metamorphosis Alpha: The House On The Hill module to $13.99 for the rest of January

It can be purchased from https://www.createspace.com/3458160 at the new price. It may take a few days to filter through to Amazon.

Amazon link (has a preview of a few pages of the module). IIRC, it was $15.99 prior to the sale.

Put it together in a box with a copy of the rulebook (original or POD) and you've got the Metamorphosis Alpha box set that-never-was.