Yes, they don't seem to be on the website but they do have them on their show stand. WPG sell 'em too at three dollars.
Meh, I suppose it really only needs to be a cork with a bit of string fixed to it, in which case the cost is nowt!
Still, I'm sure you will shift surplus properly constructed ones on this forum. 
There are a few militaria fair stores that stock these. I know one which always has them, but can't tell you any more than the bloke who runs it is called "Dave".
If SOF have them on their stand as CW says, ring them up and ask! They don't bite! 
might just do that, will make an order up to 1kg I think
Hate to bump but I just ordered one of the replacement corks from WPG and it works great on my original bottle. 10/10
Vinegar and boiling water did for me, got rid of the "funky" taste that was in the water when using the bottle.
Anyone else having issues with their cork leaking (between the actual cork and metal screw), fault in the design of the thing or cork need replacing?
Why do you always carry that umbrella?
-Bad memory. Never could remember the password. Knew no Jerry would carry one. Had to prove I was an Englishman, you see.
A bridge too far
just replace the cork.
armoury
m1a1 Thompson,sten mk2,mp40,stg44,sterling,mk2 bren gun,lee Enfield no4 mk1,Mauser Kar98, Walther ppk,smith and Weston m10 and Mauser m712
Give me a big enough hammer and a place to stand and I could fix the world.
i'll kill a man in a fair fight or if i think he's going to start a fair fight or over a woman or.......
a problem shared is a problem halved ,but an advantage shared is no advantage at all
if a job's not worth doing then its certainly not worth doing well
My cork leaks all over me but I don't really notice during games because I crawl through dirt and mud alot anyway, a bit of water on the side of my shirt doesn't really matter. 
