Welcome,
I noticed that the local Garden centre group store (Was "Wyevales) have all their seeds at 50% off"
-end of season"
It might be their end but you can grow something all the year with some protection. I collect redundant windows to make robust tunnel cloches. What I aim for are matching opening casements in wooden frames ,preferably still with hinges attached. These can be "scrounged " from any double glazing comppany and without work are good for six or seven years at least. Would be more if re-painted.Typically 1 pair covers 900mmx900mm . Thats three rows of lettuce of, say,9. You need a pair for each row as ends.All for free, you just need transport. A wire coat hanger (free from dry cleaners!) stapled across 1 end limits spread and prevents collapse..These can also be used as covers for simple wooden cold frames made to fit the windows you can get. I have a constant supply of redundant wooden fireplace crates to give sturdy 1"boards 48,54 or 60" long. If there is a fireplace fitter in your area, just ask ! They would benefit from preservative treatment but last 5years without.