I am sure there are numerous services costing $5-10/mo that would cover this and I would certainly consider that to eliminate the hosting and maintenance cost.
If I had to build it, I would expect using Lambda, DynamoDb and S3 would likely bring the hosting cost to down to a couple of a dollars a month max.
If I had to build it, I would expect using Lambda, DynamoDb and S3 would likely bring the hosting cost to down to a couple of a dollars a month max.