to buy a used hangar?
 

Is there any place one could look for a single position hangar (15x15) used?

Search for Hangar under aircraft on ebay then click on save search so that it will email your when something is found.
They do come up occasionally but you may have a long wait........

Where ae you based?, there is a bloke in the South West who builds em to order and travels to your site for the duration of the build. Hangars don't seem much cheaper second hand

What size?
15 ft metres?
If you have the land build it from timber and profile steel sheet.
I've done it eight times mostly single handed.
mikehallam

Have you looked on AFORS
https://afors.com

We used a poly tunnel in France. It stood up to some pretty serious winds.

Have used a polytunnel (sheep shed) in the past and also found it very resistant to high winds if the door is light and flexible. No resistance to break ins, though.