I will rent a car from Alamo. I definitely need CDW. Travel Guard doesn’t cover Alamo. Any alternatives?

Thanks for the answers. My own car insurance doesn’t contain collision or comprehensive (state minimum) I paid for the car in advance with a debit MasterCard on priceline.com. This card doesn’t carry any insurance either. So I either pay the offered and expensive CDW from Alamo or find an insurance company, like Travel Guard who offer CDW for much less. But unfortunately, Travel Guard doesn’t cover Alamo.