Have you already perused this thread? It seems like a promising route, I would try it if I were still in a lab. I don’t think you’ll have to spend that kind of money to get the setup you want though, I think as long as you’re able to keep the system closed and you can recondense your pentane vapor you’re good to go, obviously in a well ventilated area. Plenty of good glassware available for much cheaper, you’ll just have to piece it together yourself. It is nice to have that quality assurance from a brand name though I suppose.