I just use generic white cheap as chips glue sticks.
You get 4 large or 6 medium for £1.
Cheaper the better really. http://www.poundland.co.uk/glue-sticks-5-pack
Us version: https://www.dollartree.com/Jot-Glue-...3926/index.pro

Pretty sure back in the mists of time when I was still using abs, it stuck as well as anything else - which is to say - on an unenclosed printer - bloody awfully :-)

You can pretty much get all your 3d printing consumables from a buck store :-)