How much would you pay to support your local dealer?

[imax]

I'm a great believer in supporting local businesses and don't usually mind if it's a little more expensive than buying online for the  personal touch and ease of nipping down the road instead of the hassle of emails, phone calls, missing delivery slots and return postage if something goes wrong. However, I'm looking at getting some hard luggage (Givi) and the price difference is  ridiculous. For the cost of the 46 litre box from the dealer, I can get a 55 litre + backrest online!!

So, should there come a point when the additional cost of a local shop becomes too great to keep your business or should we support local businesses at all costs?