Well are you thinking on the reel and tubing being as one with some kind of connector for the machine. Or are you thinking on just a reel that you put your existing tubing on. That makes a difference on how you would charge. I'd say if it's just the reel then $50-$75 would be good to start it and if it's the whole kit and kaboodle then probably $150-$250 or more depending on the length of the tubing supplied. Theres so many things to consider. More info is needed to determine a reasonable price. Good luck though.. I think it's a great idea....Let me know how it goes...
About 25. To 50 bucks, it should not be that expensive to produce. I just need something on the line like a water hose reel but for oxygen tubing instead of a water hose. Automatic would be nicer and I would be willing to pay more for the automatic one.