Kegging newbie, please help!

[Jingram's_brews]

Was hoping to get it from bkt, but they're out of stock unless you want a kit, and I've already got a tap sorted out. Will probably make the plunge and get a couple of standard kegs soon though

 

[Binkei Huckaback]

Maltmiller does a small regulator for £30

 

[Jingram's_brews]

Unfortunately that also appears to be out of stock unless I'm mistaken, plus the adapter brings it to a total of £39. Please post the link if I'm being blind