Home Depot has 4 foot by 4 foot raised garden beds on sale for $9 with free shipping. It is item #202061234. It is on backorder, but as of right now it is still accepting orders (just indicating that they will be late). This is a great price so if you could use one or more the it might be worth the risk that your order is canceled.
If you spend $100 then use the code DEPOT29 to get an additional $10 off.