4 lb tub of DampRid Moisture Absorber by DampRid.  Some people use DampRid to help control kegerator condensation.

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

DampRid FG50T Hi-Capacity Moisture Absorber, 4-Pound Tub

Also Consider:  The Eva-dry E-500 Renewable Wireless Mini Dehumidifer.  I’ve used this for years in my kegerator and it works very well at keeping condensation in check… Hands on Review

Also: Kegerator Tips & Gear | Keg Repair Part #s | 5 Recent Keg Finds

Amazon Prime Day!  Roundup of Deals We’ve Identified | All Current Deals – Submit a Tip if you see anything homebrew related

More: Recent Amazon Finds