Is it bad form to sell a used tube?

I have 4 tubes ranging from 2” to 2.5”. I need a tube with a large glans chamber, so I going to purchase one of those. Don’t need these. Do people ever sell them or not?

If you can find someone to buy it, why not? Where to sell them, is your real problem. It’s not unheard of. Given the “personal” nature of it, you might have a difficult time offing them. Never done so, myself, but I’ve seen here ‘n there where members have said they were selling gear, and claimed it sold. Where, I don’t know. Ebay is my best guess. I imagine Craig’s to be a shit show with that kind of thing. You never know.

I’m not in the market, myself. Good luck.