If they are light-weight apps in terms of read/write and traffic, you could try:
(1) AWS, they have a generous ec2 offering in free-tier for new customers for a 12-month period…
(2) some shared hosting providers support nodejs which could work out budget-friendly
(3) If you look past the branded VPS providers, you can get a decent VPS box for less than $3.5 a month that would be capable of running a few light-weight strapi apps easily
Hope this helps . . . Good luck!