As others have said, Delta will price match using their "best fare guarantee", but it does come with caveats (
https://www.delta.com/content/www/en...guarantee.html) If ASAP Tickets is a consolidator, and the fare they are offering is a consolidator/wholesale fare, then they won't match. Also, to use the guarantee, you need to find the exact same itinerary in the same fare class - I have yet to find a situation like this. Good luck!