They have those at a local headshop in town, they seem to be just a mini, discreet looking bubbler. I'm sure it will get the job done if you have nothing else. I used one similar for a little.
I personally have a lovely hand crafted bubbler from the Dam and it works a treat I assume that won't work as well, but bubblers really do hit the spot. Gotta love 'em. Smoke on!