Hi there..
The wagons.. bow tops and open lots can vary in price.. some people have them in their gardens as a kind of play house or summer hang out..
The made ones can be thousands of euro and original ones are very hard to find.
I was thinking of making one myself as a kind of winter woodwork project but thats for another day... a more organised and industrious other day..
Horses are nearly free now in Ireland.. poelpe are abandoning them because they cant afford to look after them..
To get one from an animal shelter you would have to show that you have the means and ability to look after it...
Hope this helps and good luck with the work.. means to an end and all that..
onwards