Hi @raool90,
I have previously used Azure VM and in azure marketplace you can get the readymade official build of UiPath Robot Template. UiPath installs everything for you and all you need is to link it to your community cloud orchestrator. The windows license is a cost which you may have to consider as well.
When it comes to saving cost, I had a VM on schedule so that I only incurred the VM storage cost in Azure and since the UiPath robot host service runs automatically after restart, it automatically connects to your Orchestrator when the cam turns on via schedule.
I am not aware an official robot template for Google cloud or Amazon web services. UiPath loves Azure 
That said, you can install the robot exe yourself in any GCP or AWS VMs as well, it is just much faster to setup in Azure.
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