Cost-Effective Ways to Cross-Reference Branches by Zip Code and SKU

I am looking to see the most cost effective (credits) way to have a Lindy cross reference all of the branches we sell to by zip code and our certain SKU numbers, and then searching another database looking at the emails for those branch managers by zip code to see what additional products that branch should sell of ours. has anybody created something like this or have any suggestions on the best flow to do this?