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Adding dummy record with long TTL might be the easiest solution as you said. If the client don't follow TTL but keep bombing your domain, other option could be using ALIAS record. Aliases are resolved for free when certain conditions are met. If your queries are from the internet, you could use e.g. internal ELB you already have for some other purpose as alias target. Or if you don't have suitable target, create a dummy resource and block traffic with security group to avoid charges for processing requests.
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The dummy record is in place and a peek in cost explorer suggests it might have reduced DNS traffic at least in half. I'll know at the end of the day how effective it was. Converting to an alias is a good idea. I have that ready to go. Thanks for the suggestion.