Rebreathers are way cool, I wonder what the price per dive breaks down in $$.
Hard to tell yet. We took 3 bailout bottles that were just back from Hydro and got them filled, and topped off our Dil and O2 bottles before we started diving. Had to top off O2 again before leaving and our gas bill was $30.
If not for the extra fills due to Hyrdo's we'd have spent about $15 in gas for the entire weekend. Comparable amounts of OC diving tend to cost us $70-80 in gas, and we are much more limited in time/distance. I can't recall what we paid for sorb last time we bought it but I think I used about $15 for this trip.