I know that people are using P40 and P100 GPUs. These are outdated but still work with some software stacks / applications. The P40 GPU, once very cheap for the amount of VRAM, is no longer as cheap as it was probably because folks have been picking them up for inference.
I'm getting a lot done with an NVidia GTX 1080 which only has 8GB VRAM. I can run a quant of dolphin Mixtral 7x8B and it works well enough. It takes minutes to load, almost too long for me, but after that I get 3-5 TPS with some acceptable delay between questions.
I can even run Miqu quants at 2 or 3 bits. It's super smart even at these low quant levels.
llama 3.1 8B runs great with this 1080 8BG GPU at 4_K_M and also 5 or 6_K_M. I believe I can run gemma 9B f16 at 8 bpw.
I tried Mistral Nemo 12B instruct this morning. It's actually quite good. I'd say it's close to dolphin mistral 8x7B which is a monster in size and very smart, about 45 or 50GB. So I'd say Arli is a good deal Mistral Nemo 12B for 4 or $5 per month and privacy so they claim.
If you don't mind logging for some questions, you can get access to very good or if not the best models at lmsys.org without monetary cost. Just go to the "Arena". This is where you contribute with your blind evaluation by voting which of two is better. I often get models like 4o and sonnet 3.5 by Anthropic, google's best, etc., and at other times many good 70B models. You see two answers at once and vote your favorite between the two. In return, you get "free" access.
Be careful with AMD GPUs as they are not as well supported for local AI. However, support is gaining ground. Some people are doing it but it takes effort and hassle, from what I've read.