It’s changed to once now, I got lucky and got my 2nd one before Dec 3rd 2019.
Rebate Limit
Individual and business applicants are not eligible to receive more than one CVRP rebate either via direct purchase and/or lease as of December 3, 2019. Applicants who have not already met their rebate limit prior to December 3, 2019, will be eligible for one additional rebate.