Nitrous question

Ok I may be selling my Nitrous Express kit that I have to a kid at school but who knows if he’ll buy it.My question is how much should I ask for the kit consists of either a 10 or 15 cant remember pound bottle/purge kit/bottle heater/wet or dry kit set up/nitrous fogger nozzle/all the steel braided lines/the jets/and blow down tube.So how much should I try to get out of this kit its in pretty good shape very minor scratches on the bottle.Am I asking to much for $300.00?

Sounds about right i wouldnt go under $250

ebay.com and see what the going rate is, make yours close.