Fairly impressed with how this turned out.
Ingredients:
-Hot glue
-Duct tape
-$5 hand vac (700w, 240ac)
-Inverter in the car (match power with vac)
I literally just whacked a hole in the side(the air vents) for the hose, then duct taped and hot glued every leaky bit to seal it.
Result:
<iframe width="420" height="315" src="http://www.youtube.com/embed/lYEcixf5Oes" frameborder="0" allowfullscreen></iframe>
Or
Not sure how this compares with the Bravo pumps (hopefully someone can post a vid of theirs), but for $6 kiwi (3 pounds) it's gotta appeal to some of you guys considering the results!