What is the average dealer mark up?

mc is ballpark correct. When I had my store I paid approx: 40% off retail PLUS shipping for components for one at a time. Small additional discounts where available with the purchase of multiple units. With cables and other tweeks, up to 60% off was the norm, again with modest discounts for larger orders. All varied a bit with the different companies and sales reps. mc is also correct about companies requiring minimum purchases for the whole line up to be able to carry the line. This, for me was a deal breaker, too mush initial investment. The old saying is true: "If you want to make a million dollars in audio, start with 2 million".

Well bob540, you are clearly not a B&M customer, you said: "I want retailers to be able to stay in business",  right why? So you can take up their time for free? Listen to gear you might be interested in to purchase elsewhere? Just so you know, savvy dealers can spot you out in just a few minutes if not sooner. Please don't bother B&M dealers, they will be fine without you, by used or online.