There is a chicken shed on next doors land which will hold about 30 birds and I've swapped for 1 deer leg, a coop to hold his 4 hens and a leg of pork

I now have to move it.... It has a square axle on it but no wheels... I used to have the wheels on another shed..but loaned them to some barsteward who didn't return them.....
Options are
1. take it apart. I don't mind this because it needs roof work and new lids to the nesting boxes and it may just be easier.
2. see if my friendly farmer can lift it with a tractor for me (my straps aren't long enough.
3. buy new wheels.
Option 3 is best for me, cos then it is portable and I can move it around.
I don't really know what these are called though and "shed wheels that fit in square axle" isn't helping.
Does anyone know where I can get these?
