Buy them when you buy a vacuum cleaner - yes they are quite expensive - but each of them lasts 6-9 months - so in terms of usage costs even not so expensive. The reason I suggest buying these when purchasing a vacuum cleaner is that, as I have found out the hard way, if you don't buy additional things to go with the product when you originally bought this product, you're not buying it can later if you need them.
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GreenFist Professional Lemon Scented Pot & Pan Dish Soap Liquid Refill - Light Or Heavy Use, 128 Ounce (1 Gallon)
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