Is there a dirt corner you can put it over? Dig two holes, anchor with a few big rocks and fill with concrete. Prop it up with wood so it doesn't fall over while drying.
If not, you would probably need to rent a concrete bore drill. I am sure there is a construction equipment rental place somewhere by you. This would probably be expensive.
The cheapest but crappiest solution would be one of those concrete fence bases. I am sure you could find that at a more industrial (as apposed to consumer based) hardware store or some sort of salvage yard.
Like this but typically concrete color: