Pay now and....wait for your part.

I am normally very satisfied with the level of service from Goldwagen, but last week was the first time I needed to get a part which they did not stock and unfortunately my experience was not too wonderful. Since they don't stock the part, I had to pay in advance (understandable), but tomorrow it will be a week since I paid and ordered the part and the local branch just says it is on it's way...hopefully it will be here by Friday (exactly a week since I ordered and paid). How is it possible, in this day and age, that a part which is in stock at the national warehouse, takes a week to be delivered? I find this unacceptable, especially since they are insistent that the customer pay upfront, but then they seem to be less bothered to deliver a paid for item. It just does not sit well with me and I am extremely disappointed with Goldwagen.