Cheapest place to buy a CMOS battery?

This is common as dirt 3.3v coin battery, pick one up at a grocery store, walmat, drug store anywhere they sell batteries. Not worth the shipping to buy online.
 
It's a watch battery.
Also in my dog's underground fence collar.
Walmart or one of those watch kiosks in any mall.
They cost about a dollar or somesuch.
 
Thank you, I have been away from the computer building hobby (and apparently, battery buying) for a while.
 
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