Best deal ever was the "Chogi Shop" at Aldergrove in the early 80s.
NAAFI would barely touch NI then, so the whole Province worked on Chogi Shops (can I say that these days?), even at the Mill at BBK - where you could get a burger and buy toothpaste 24/7. There was so much competition for the (very lucrative) monopoly concession, that good deals were brokered. At Aldergrove, one of the deals was free haircuts for all uniformed personnel! And not too bad ones either IIRC.
Also (allegedly!!), OC Admin was asked by the Chief Chogi what colour he wanted his Mini (car, not skirt), as that was the going rate for the "thank you gift" from the successful bidder. I'm sure OC A made his excuses and left.............