ᐅ Selling a detached garage. Who buys used garages?

Hello,

I would like to expand my garden and therefore sell two prefabricated garages for pickup. Unfortunately, I can hardly find any information on this, but I was told you could get around 3500 € (about 3700 USD) for one garage. That seems a bit optimistic to me.

What do you think I could realistically get for them, ideally with pickup included, and who might be interested in buying something like this?

Thanks

Just for your information: The garages are over 20 years old.