Where can I get a free GPU?

I'm curious to know, as a cryptocurrency miner and finance enthusiast, where can I find a reliable source to obtain a free GPU? Given the current demand and prices for GPUs in the market, I'm on the lookout for a cost-effective way to expand my mining capabilities. Do you have any suggestions or resources that might be able to provide me with such an opportunity? Additionally, would it be possible to share any insights or advice on how to ensure the GPU's performance and compatibility with my current mining setup? Thank you for your assistance in this matter.