Quarantining an Older/Adult Snake

[TofuTofuTofu]

The person selling him is a reptile educator at a rattlesnake conservation place. He said the snake came from a local breeder (Gainesville) and a friend sold it to him when the snake was about 2 years old. He told me he has three younger TPRSes with plans to breed them, and that he was willing to sell the older one to someone looking for just a pet snake. I shared a photo of my enclosure with him, too. He sent some photos of the snake and he appears to be well taken care of, and the owner did answer all my questions about the snake's health and history, so hopefully everything should go well. I'm going to drive to go pick up the snake, but probably can't for about 3 weeks until our weekend schedules are free at the same time. I'm excited to have found one and hope everything goes okay! I got good vibes from the owner, unlike the one breeder I saw at an expo near me. I have just texted him to ask about what size enclosure the snake is currently in.

I could go with an aquarium-type glass setup, but find the lids on those to be pretty bad usually, and not escape-proof. Any ideas regarding that? I am hesitant to just buy a smaller actual reptile enclosure with a good lid, because those are typically much more expensive, and like, I won't use it for more than a few months (not planning on any future reptiles till another pet passes away, which would probably be at least 10 years from now, lol)

I'm trying to do a photo, but it showed up sideways when I first uploaded it, and didn't change when I asked to rotate it in the edit menu. Geez, I'm not even old, idk why this is happening to me. You can get a general idea of what he looks like though, I guess.