Just run it on CPU, on your own machine. That's the cheapest way. You could also rent a free/cheap VPS, and even parallelize across multiple machines/cores if you need it.
Maybe I'm grumpy today but I am shocked at how many responses you are getting where people think this is a novel idea. Has the engineering mindset really shifted into a default of "buy" even when build could take less than a week?
I was surprised, too, but then I realized they all work at Qdrant.
But the general dialogue around AI-related tools is surprising to me. The production parts of the langchain, embeddings, etc tools can usually be built in a few hours with better observability, performance, and maintainability.