I agree with your's recommendations, and I'd like to add a couple more options for you to explore. If you prefer browsing physical stores, you might want to check out local thrift stores, flea markets, or even garage sales. Sometimes, you can stumble upon hidden gems at bargain prices. Another fantastic resource is board game conventions or retro gaming expos. These events often have vendors who specialize in selling retro board games, and you can get a chance to see and try the games before purchasing. Additionally, joining online communities and forums dedicated to retro gaming can be a great way to connect with fellow enthusiasts who might have recommendations or even be willing to sell/trade their own collection. Best of luck with your retro gaming journey!