i have a nitrous pump for sale
tried of paying $3-$4 per pound and running around last minute to get your bottle filled

you can get 55lb bottle, and this is a transfer pump to put the nos into your tanks, just like this one, i even have a weight scale to go with it.
i only pumped 5 55lb bottles thru this.
Nitrous Oxide refill pump station kit new : eBay Motors (item 350152206475 end time Oct-03-10 18:07:53 PDT)

$400