To add to what others have said, there's likely some characteristic separating the Cokes at different prices.
So you could just use that characteristic when ordering.
Example: A shop sells a can of Coke for $0.75, a bottle of Coke at $1.50 and a 2 Liter of Coke for $3.00. It's certainly natural to say, "I'd like a bottle of Coke please.". The shop owner should perfectly understand what you're asking for. If he reaches for the 2 Liter, you can say "I mean the dollar fifty one, please".
And if you want to be super explicit, you'd just say "I'd like a bottle of Coke, the dollar fifty one, please".
Another common example is at a restaurant, you may see on the wine list something like:
Vern's Vineyard California Pinot Noir 8/15/50
Along the top of the list, you should see something like "Glass/Carafe/Bottle". So, the list means a glass of Pinot is $8, a carafe $15, etc. So you could order "A glass of Pinot Noir" and they'll know it's the $8. But, if you want to be clear, you could say "The $8 glass of Pinot, please".