I cannot say specifically on sodas since we stocked up at Costco (before mugs were released). But hot tea was $5+ (almost $6, because I remember cringing over it) and regular non fancy coffee was $5 too.
So I would guess bottled soda would be around that.
If you guys drink soda, tea, hot cocoa or non fancy coffee, the mugs aren’t a bad deal honestly. But if you don’t mind costco-ing for your stuff then it’s different.
I bought $7 coffee the first morning at the coffee shack. After that we went to Costco and picked up canned coffee
just couldn’t stomach shelling out $7 per cup.