I am using a dedicated server which emulates VMs, but you can get only VMs for a very cheap monthly price, like £2.
It depends of course of your language, if you are doing a bot in a windows-only available language, well, you’ll need a Windows server and prices are way higher, but if it’s a NodeJS bot, it will be very cheap for sure. Java too, but beware of the RAM available on the VM as Java is very consuming.