In case anyone is interested I have made a comparison of the recent internet sites mentioned on this list where butane can be purchased: South Summit: http://www.southsummit.com/glowmaster%20stoves.html GMF2-- 12 cans butane, 8 oz per can-- $21.95 +$7.97 ship 32 cents/oz. GMF3-- 24 cans butane, 8 oz per can-- $69.95 +$12.97 ship 43 cents/oz. REI camping http://www.rei.com/cgi-bin/ncommerce3/ExecMacro/REI/search.d2w/input?query=b utane&brand=any&min=0&max=9999999&x=32&y=15 GAZ470-- 6 cans butane/propane 80/20-- $33.00 + $2.99 ship 37.5 cents/oz. GAZ270-- 6 cans butane/propane 80/20-- $27.00 + $2.99 ship 56.8 cents/oz. MSR Isobutane-- 6 cans-- $23.10 + $2.99 ship 72 cents/oz. Primus 215g-- 6 cans butane/propane/isobutane--$25.80 + $2.99 ship--57.5 cents/oz. Primus 450g-- 6 cans butane/propane/isobutane--$43.49 + $2.99 ship--45.3 cents/oz. Lucienne http://store.yahoo.com/a-zlighters/r1.html 13 oz. butane triple refined 6 cans for $24.00 plus shipping $7.50(est)-- 40.3 cents/oz. Filling adapters for the GAZ and Primus are friction fit and can be obtained from Sulphur Springs Models http://www.steamup.com/sulphur Adapters for the MSR and South Summit butane are screw-on and can be obtained from Sulphur Springs also. The Lucienne cans have their own plastic filler spouts. PATRICK DARBY TIMBER & TALLOW BRANCH RR COVINGTON, LA