I know for a fact that the 214 Sqdn Association stocks 214 Sqdn ties,
A roundabout way to obtain other Sqdn ties might be to contact the 214 Association and ask for their suppliers details. That suplier probably supplies other Sqdn's and Associations.
http://www.214squadron.org.uk/default.htm
Got to admit that I only had to buy the 2nd one 40 odd years after the 1st one, it became a little too beer stained
Having keyed all of the above, I looked at the tags on the back of some of my ties. It seems that there a several companies in this business.
Recent 214 Sqdn tie, made by
Maddocks & Dick Ltd, Royal Mile, Edinburgh, EH8 8BJ. Tel 031-556-6012
C.1959 214 Sqdn tie, made by
Ryder & Amies, Cambridge.
Recent RAF BEA tie, made by
Keltic Ties, Tel 08450666699