Hi Spivv, Welcome, stay tune here and you should get all the answers you never wanted.
   You have acouple options, Basspro and cabelas have sm to lg "coolers that drop right in your boat and your good to go, $100-150 would be my guess, or on the same pages they have the fixens to make your own. you may want to check them out and maybe just get the bubblers that hook up to the battery. the other thing to think about is how you will keep the fish cool.
   while your waiting for more feedback check out the catalogs.  Also while your looking us over, look on this same site under March fish-ins and come join us. V-DUB-YA

The first bass boat I own had a cooler a lot like the Rev.'s.  I put some good foam attached to the lid and had it for a seat.  The cooler had two holes driilled in the side and plastic flexible tubing connected to the side of the boat.  One below the water line and one above.  I had a toggle switch attached to a (bilge) pump that drew water from the lower hole and filled the cooler until the water overflowed out the top line (hole).  Bubblers are fine but they don't work as well as moving new water into the livewell.  You can choose the size of cooler (plastic) you want for the size of your boat and pick up a relatively inexpensive lower volume pump and plumbing parts for pretty reasonable.  I look forward to seeing you either at the meeting or on the water.

We owe it all to our newlywed Glenn