2 spare trailer tires on rims 14"

I have 2 15 inch rims with tires mounted on them. One is worn and the other is less worn. Both are starting to have some cracks in the treads, not the sidewall. Tire size is 205/75/R14. They hold air just fine no issues. Im just buying new ones. Better to be used as spare tire in case of emergency and not as the main tires. Asking 50 for the better one and 30 for the worse one.