Yes MWR will come up trumps most of the time but some of the well known surplus dealers also have them
Anchor supplies etc.
Price wise I have no idea as they have never really floated my boat but they used to be under £100
They are not worth that much more to be honest they were made to a budget and the mineral glass means they are usually pretty battered. They feel really light and flimsy compared to a CWC. I am not a fan - don’t let me put you off though.
The longer hand version looks a bit better than the shorter to my eyes.
I would look for a Pulsar RAF chrono if looking for a cheaper MOD watch. Gen 1s are harder to find as they had a dodgy crown (but better looking), so left service quite quickly, the Gen 2 are more common, both are quite good looking and are robust enough for daily wear (they are no seiko gen 1 or 2 though). They both have the same mineral crystal as the G10s though.
Gen1
Gen2
Images nicked from the web