$300 is practically free for something like that. I am reading the passive solar greenhouse book (like all good energy conscious books was written in the 70’s) and will build a passive solar greenhouse someday.
My ‘dream’ is a 3-season porch off the west-facing living room. My ex tore the deck off five years ago...and then just never did get around to finishing that project...or any others for that matter. *ROLLEYES*