Is there a free trial available for the ARM64 SaaS plans?

Last verified against genymotion.com:

Yes. Genymotion SaaS trial requests include arm64 plans, and the trial limits depend on whether you choose Individual or Enterprise. See the trial flow in How do I get the free trial for Genymotion SaaS Cloud?.

Individual trials give 60 free minutes and up to 2 simultaneous devices. Enterprise trials give 1000 free minutes and up to 10 simultaneous devices, and the request is reviewed by sales.