The Aqua Shade Base Complete is a package of everything you need in order to float your umbrella.  For those who don't mind trimming your bottom pole this option is by far the most cost efficient.  How to trim your umbrella
 
The base is a patented rugged plastic container that fills with water / drinks and provides up to approximately 120lbs of stability while serving as a small tabletop. Choose between natural (white), blue and black base.   Optional high density foam insulation kit availble for keeping drinks cold for a short time. 
 
0.235" Thick Rugged Plastic Base
Inflatable float ring 0.35 mm Vinyl with Wide Mouth Stem Valve for Easy Inflation and Deflation
Fill Cap
1/4" Stainless Steel Knurled Thumbscrew
1.5" Test Plug