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I would like a cheap server to use zabbix. I believe that 512-1024MB will serve me (I still do not have many hosts) and that it has a good latency for Brazil (Usually the Miami servers get better)
You could get the smallest Vultr instance (512MB) in Miami for $2.50/m. I've had one of those for over 6 months and no issues so far. Latency to Sao Paulo is around 110-120ms.
I forgot I have two of those spun up of free credits running the LET RC5. They do OK for what they are.
I won't be back until @bsdguy is released.