I guess I swim upstream on this issue. If I were a vendor, I would not ship anything that was not cleared on a credit card first - if I shipped it and then the card was either overdrawn or stolen, I'd be responsible for the charge and out the product.
As for a brick and mortar store, around here most of them are closed Mondays to make up for being open on the weekends. So if your order came in on Saturday, it would be totally reasonable to not be processed until Tuesday.
I think in some ways, we've become so used to instant service by the internet only stores, that we forget that brick and mortar stores have customers inside the store to work with too, not just a computer.
I'd cut them a little slack. If you don't have it by Friday, I think that would be reasonable unless you're paying for overnight shipping.