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It’s usually cheaper if you can source it from the manufacturer even paying their shipping rate.This is rarely the case. In fact, it's against Amazon's policies for manufacturer/third-party listings.
But I've found that even when that's the case, returns can be such a gigantic hassle it's not worth it -- getting an RMA, having to pay for return shipping, being forced to use an inconvenient shipping service of their choice, things like 15% restocking fees...
If you're buying something for the first time and then discover it doesn't work the way you expected, it's amazing how much easier and cheaper Amazon returns are.