No, it's definitely not cheaper to buy, maintain, properly secure, audit, and continually replace inherently insecure electronic systems that are used two or three times a year at most. Elections are also not a place I personally think we should be cheaping out.
you forgot store. The state has to distribute, and collect voting machines 2-3 times a year and then what, they sit for 4 months? With armed guards and audit logs?
Paper vote by mail, when the ballot is ready, the print and mail it to you, you have 3-4 weeks to fill it out and send it back. High voter turn out, easy access for people with difficult schedules, No need for transportation. keep the ballots until the election has been certified