Have you ever made your own soda (pop)?

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Earlier today, I read an article recommending five small kitchen items to help you save money on food costs. I already have and frequently use four of them (coffee maker, bread machine, water filter, and slow cooker). I'd never even heard of the fifth, though: a soda maker! In case you've never seen one either, they pump CO2 from small cartridges into refillable bottles of water. No electricity needed! Then you add your choice of flavoring, fruit juice, or syrup. I think this is one of the coolest ideas ever! I unfortunately love soda, even knowing how bad it is for me, so I really like the idea of making my own with healthier flavoring and less waste from packaging. I'm not sure that it would save me money, because they're expensive, but it might be a groovy gift or a good sale find. ;) Have you ever used a soda maker? Do you think it would save you money to pay between $75 and $120 for one (plus cartridges and flavoring)?