Salute Ironblade,
I'll gladly tell you sir,6 weeks of searching and bidding(and getting out-bidded sometimes) yep you have guessed it,
EBAY
It's amazing the stuff that comes up,i mean one guy had a whole
wooden pallet about 4' high by 3 feet by 3feet full of "surplus" oxygen masks,avg ending selling price? right around $75.00 to about $150.00.sheesh,all i would need is one.
The gauges,i was pretty lucky,found some that were up for bid starting at $9.99 and avg i was winning them right around $12.00 for 3 plus shipping ,$18.00 total. Look for BOB98 at EBAY,
he has had some great pieces, hope this helps,see ya' in tha virtual skies.