Not confirmed about USD but reasonable as they are in Newburgh IN.
Another US source
http://aircraftproducts.wicksaircraf...be-2/tr100-065
Several wheel assemblies, apparently not sold as tire only
https://www.motionindustries.com/tax...000000%7C10+in
Carlisle seems to make tubes for that size
https://www.walmart.ca/en/ip/Carlisl...RD5S245Y9R5E5J so might make the tires too but a quick look on Carlisle's site didn't find the tires....
It seems they do, as part #519016
https://simpletire.com/carlisle-3.40...5-519016-tires Several sites show the tires as not stocked but orderable....