I think the prices are pretty much the same everywhere. Sometimes you can get some discontinued or clearance ones for about $10. I was going to mention the bottle brush cleaner too. They work really well. I have two of the big SIGGs that I take to work every day and try to drink both. I think they are about 40 or more ounces each, but I'm not sure, but they are really convenient and are not plastic. The SIGG ones were the only aluminum ones I found that do not leach the aluminum back into your system. Kleen Kanteen are also good and are all stainless steel.