Yeah, I've seen kits on Amazon and Ali Express, which is actually what made me wonder if there were any Arduino ro esp32 projects that I could build. I did find an esp32 project for one, but all of the esp32s that I have don't have enough I/O pins to build one, and I was trying to see if I could build one with the parts I have lying around. I have an Arduino mega, which has plenty of available I/O pins, but I haven't found any code to build one with an Arduino.
Eventually, I'll probably end up buying one, but I know that I am going to want a multi-channel scope with all of the bells and whistles, and I can't really justify that for as much as I would probably use the thing. Back in the early 90s, I worked as a broadcast engineer, and we had some really nice scopes that cost in the 10s of thousands of dollars (even back then). For what I need today, I could probably get by with a single-channel scope with a 5" screen, but I know I would end up splurging on something that I didn't really need.
And, oh by the way, if you picked up that Owon SDS7102V for $250, you got a really good deal.