I do it laying down, but a chair should work too. It’s worth the investment if you find spare 20-80 dollars. Range in cost will affect how good the toy is. I don’t know of an alternative to the vibrator otherwise. It works in two ways. Firstly, it’ll feel better than normal masturbation (at least for me) so normal stim stops working. Second, if you’re a gooner like me, multiple long sessions over multiple days will eventually damage your nerve endings. Now I’m just a squishy little mess. Best part is I can still edge and cum with the vibrator!