Resources would be a good item to spend on repairing sell chests, as they currently don’t really have a use (they were supposed to pay for build mode but you now get charged $ instead). A combination of resources and money would be balanced, with the price increasing as you repair each chest more
Repair price:
Resources (500 x [times repaired +1])
In game money (1m x [times repaired +1])
So for example, the first repair will cost $1m and 500 resources, and the 50th repair will cost $50m and 25k resources
Repair price:
Resources (500 x [times repaired +1])
In game money (1m x [times repaired +1])
So for example, the first repair will cost $1m and 500 resources, and the 50th repair will cost $50m and 25k resources