They are a bit pricey to make. Mexican Coca-Cola (For the bottle) you tend to have to buy by the case of 24, which is $1 a bottle, plus S&H, which can vary from $10 to $30, depending where you order from. Then, if you don't have a printer, printing the labels at a public library can cost $1-$3. The American Coca-Cola Caps you need come from 8 fl. oz. Coca-Colas(Unless you're making a Quantum, and those blue caps come from Seagrams Wine Coolers), and are typically sold as six packs, which usually go for $6.50. Then you need a utility tool, such as a Gerber Suspension for example, which can run $25-$80, but is a one time buy. Then you need superglue, a measuring cup of at least 600 ml, scissors, and a funnel, which should all be a one time buy, coming to around $10-$15. Finally, the other materials to refill the bottle, which can run anywhere from $2-$5 a bottle. They are indeed rather pricey to make, but fun nevertheless.
I am finally content with my set, and I am considering making a Sunset Sasperilla next.