My $6.75 per year VPS was a Black Friday sale from Dedirock on https://lowendtalk.com. Some of the Black Friday sales are still being honored. The site https://cheapvpsbox.com/ has a nice search engine for cheap VPS sales.
They seem expensive otherwise so I’d go with Hetzner for most other stuff. Heck I’ve even used Contabo too (they don’t have the best reputation, but it worked out okay for me).
I recommend a dedicated $40 hetzner or OVH box and just keep all your projects on that. They're pretty powerful. I was spending a lot on a bunch of $5 linodes until recently and you have to keep them upgraded etc...