OpenShift - you can get some instances for free

Cloudatcost - One time fee. The instance is laggy sometimes, but it's gotten better since they launched and I only paid ~$20 (after coupon) a couple years ago so not a terrible value.

self-host! - Since I like tinkering with bare metal, I have a server in my home that I CDN through CloudFlare. CloudFlare is mostly to shield my ip address and make it less obvious I'm hosting a server (inbound is HTTPS using CloudFlare origin certificates). Currently have a server that just runs Docker containers, but might try Xen.