A Coke and Rum is about $4 at a bar.

Cheaper hack. Get a mini bottle of rum for about a dollar at a liquor store, get a value Coke at Burger King for $1. You just got a $2.14 Coke and Rum! :D

For Starbucks, an iced Latte costs about $4.

Cheaper hack. Get a single Espresso for about $2.50 and fill it up with ice, sugar, and free milk at the Condiments bar. You just got an iced Latte for about $2.50! :D

At a bar, a Strawberry Daiquiri could cost about $10.

Cheaper hack. Get a Slurpee from 7-11 for about $2 and a bottle of rum for about $1. You just a Strawberry Daiquiri for about $3! :D