I read once about a custom bike builder from Japan (Panasonic I think it was) that offered millions of combinations and still managed to deliver the bikes the following day. People thought they were being had, so Panasonic started to let people wait 3 days before delivering.
I believe it was FedEx which does something like this. For 2 day delivery they stick the package in a storage room for a day, then put it into the normal 1 day delivery system. Which costs them more than 1 day delivery, but lets them sell to a broader market.