I had a Whale Gusher Titan on my last boat
. $150 at defender. Never had to use it, we were on the "dusty bilges" program for the most part and used a wet/dry vac to pick up what little did accumulate.
They aren't portable. You install them where you can reach the (removable) handle from the helm
, and plumb them in.
Portable ones aren't as useful because you need five hands to hold them in place, hold the discharge overboard
, and pump them. I've tried.