I want to GAP insurance for my 2015 Honda Accord. My auto insurance provider GEICO does not offer GAP?

I want to GAP insurance for my 2015 Honda Accord. My auto insurance provider GEICO does not offer GAP?
Added (1). I want to GAP insurance for my 2015 Honda Accord. My auto insurance provider GEICO does not offer GAP? Are there any insurance providers who speciale in GAP or loan/lease coverage only and offer this insurance after vehicle purchase? I have my loan through Bank of America and I wish to stay with Geico.

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