Need M4 Mags, but stuck!

[declancase]

Does anyone know where I can get these Mags in the UK? Only want to buy one to see if it works as my Mags misfire. I want to get them but I don't want to wait the wait, and don't want to spend ten pound on postage. http://shop.ehobbyasia.com/magazines/g-p-m4-m16-130rd-ball-ball-mid-cap-aeg-magazine-black.html