It's frustrating to me, too, and supply-chain management is what I do for a living. But the problem is understandable, in a way. Now in fact, the shipping they should use wouldn't cost $10.50 -- probably more like $5 -- but they're almost certainly using an automated system that has a minimum shipping charge by one of the Big Three (UPS/FexEx/USPS). In situations like this, the only way to make it worthwhile is to buy a bunch of the parts so that the minimum shipping charge isn't more than the part costs.
I have an electric razor that uses disposable lather cartridges. The ones I want are difficult to find in stores. I used to be able to buy a case of them (twelve boxes, five cartridges/box) at a good price, and without the shipping being prohibitively more than the product, with the case lasting about a year. The vendor has stopped selling them by the case and now only sells them individually, which makes them much more expensive and not worth my effort. I've stopped using their cartridges and am just using soap even though the gel cartridges were easier on my face. (Fair skin, coarse black hair; not a nice combination.) Grumble.
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I have an electric razor that uses disposable lather cartridges. The ones I want are difficult to find in stores. I used to be able to buy a case of them (twelve boxes, five cartridges/box) at a good price, and without the shipping being prohibitively more than the product, with the case lasting about a year. The vendor has stopped selling them by the case and now only sells them individually, which makes them much more expensive and not worth my effort. I've stopped using their cartridges and am just using soap even though the gel cartridges were easier on my face. (Fair skin, coarse black hair; not a nice combination.) Grumble.