I got it from Menards I believe. It might have been Home Depot. Don't bother with the decorative panels, they cost to much and are usually smaller. I used 12' corrugated galvanized steel roofing panels. Cut them with an angle grinder. They are rated as 2' wide, but are actually 2'2". They are not necessarily cheap ($30 if I recall), but might be cheaper then making a raised bed completely of lumber right now with the lumber prices so high. I did use lumber to frame the box though. I use 2x3s instead of 2x4s. Menards sells 2x3s treated and untreated, and they are a lot cheaper.I want some better raised beds. Where can I find the corrugated metal?