Looking for Big Box PC Games

Hi all, Recently I’ve been getting into vintage Big Box PC games and I was wondering if there were any spots in Houston where you can pick them up. The retro game stores in the area all seem to focus on console games. The Half Price Books near me has a pretty small selection of PC jewel cases (no big box games) but it’s mostly shovelware crap like Solitaire. Likewise, despite large swarths of videos on YouTube of people picking up rad stuff at Goodwill, I have never had any such luck.

And, before anyone says something to this effect: I have looked on Google, but I’m hoping someone knows a smaller store that might not have the search engine optimization that the big boys do. And yes, I’m aware of Steam and GOG. That’s not what I’m asking for.

Thank you for your help!