Consensus seems to be reusable is OK. Should have given a little more background initially, but I live almost literally on top of a major road and my home is very dusty. Also, I'm in NJ, the system is a heat pump, and the coil will be dry most of the year, if it matters.
I get my filters from filtersolutions.com and was considering this. If someone has a recommendation for an alternate supplier that can make custom sizes, let me know.
Thanks to everyone who responded.