Amazon currently has these 20 or 24oz BPA Free Polar Insulated Water Bottles starting at $4. Just try different size and color combinations until you find one that is $4. These sell for $8.95 + shipping from LL Bean, and the reviews are very good.
* Double-wall construction: a thermal barrier of air keeps heat out and cold in.
* Polar Bottles do not contain Bisphenol-A (BP-A), a potentially toxic compound.
* Fits standard bicycle water bottle cages
* Wide mouth allows ice cubes easily into the bottle and makes cleaning easy.
* Dishwasher and freezer safe.
Combining the thermal properties of an insulated vacuum bottle with the lightweight, flexible features of a plastic bottle, the Polar Bottle® is the ideal choice for active people. Simply fill with liquid and ice and hit the trail. For even longer cooling power, fill your Polar Bottle® and store it in the freezer before use. Either way, it will keep liquids cold twice as long as conventional water bottles.
Shipping will be Free with an order over $25 or with Amazon Prime. See how to get a Free Amazon Prime Trial HERE.