Are they really going to complain about the $.01 or $.10 or $1 price difference? And even if they do can't you just give them the lowest price?

It doesn't matter if they would complain, I just said they'd be confused. Why add a potential sticking point? It sounds like OP is trying to sell a new product, playing pricing games at these early stages is a big distraction. Someone up thread said charge $49 without cents -- go with that and get on with making the product better.

That's such a minute chance of happening, it shouldn't be a concern in the slightest

The chance may be a minute, but this can have great reputational consequences. And, to begin with, I consider such practice immoral, even if it is a difference of 0.01.

In a goods shop you may fit such an experiment, maybe, with marginally different items, but not with your main product for sure.