here are some options so far; depends on if need/want bleed valve or pressure gauge, and whether you have a scba or scuba... (thanks to everyone who posted links)
northshore compressor
http://www.northshorecompressor.com/...cessories.html
various options including scba to paintball assembly with gauge/bleeder ($160.82)
air hog
http://www.airhog.com/pigmee_acc.htm
they sell a female/female foster adapter ($42) that could be used with a ninja whip for cheap fix
misc other options
joe brancato (Joe's Air Tanks)
http://www.hamcontact.com/airgun/HoseAssembly/
variety of options, including scba to paintball assembly with gauge/bleeder ($169 plus shipping)
also looks like he'd make 3 foot extension with stainless steel female quick disconnects on each end for $69
compressed air specialties
http://www.scubacompressor.com/shop/...ebc2e809592017
various options, including scba to paintball assembly with bleeder ($115 without gauge, $150 with gauge)
mac1 airguns
http://www.mac1airgun.com/pcpcomponents.html
several options, including scba to paintball with hand tighten fitting, gauge, and bleed valve $140, stainless steel
air hog
http://www.airhog.com/cf_tanks.htm
can buy a 88 cu ft 4500 psi cf tank which includes a filling assembly for $650 (need to add female quick disconnect)
or you can get the same thing from pyramyd air.
http://www.pyramydair.com/cgi-bin/se..._search=Search
they jack the price up to $700, but with 10% off coupon, and 5% bing cashback you can get it down to a total of $595 plus shipping