"...Florida's NGV rebates that cover as much as 50% of the incremental cost of a new vehicle or vehicle conversion, up to $25,000 per vehicle and $250,000 annually per applicant. Note that this incentive applies to propane vehicles as well.
Maryland's NGV vouchers for the purchase of new and converted NGVs, up to $20,000.
Arkansas' vehicle and infrastructure rebates for 50% of an NGV conversion cost, up to $4,500. Note that this incentive also applies to hydrogen fuel cell vehicles, as well as propane vehicles and infrastructure."