Where to dispose used GPU graphics cards?

GPU is the core part of AI computing, some PC gaming, and cryptocurrency mining. How do you guys dispose the upgraded or obsolete GPUs, particularly for small businesses? What do you think about the proposals from this link? 10 Best Places to sell GPU for cash for the Most Returns https://www.buysellram.com/blog/10-best-places-to-sell-gpu-for-cash-for-the-most-returns/