For the internet, where I initiate the purchase, no demonstration, etc. I just ask whether there is a discount (for a decent sized purchase, not a $30 belt). For the big two in the adjoining midwest states starting with I, the discounts without bargaining other than asking, have been typically more than their frequent 10% off sales for music.
For the past five years, most of my purchases have been through my local consultant, sort of a bricks and mortar dealer, but much more. We talk at length about what I want to accomplish so he understands what is going on. He has visited my home many times to hear my system as it has evolved and even set up complex shootouts with different equipment and experts running the shootout - at his expense - so that I could hear what worked best. When that turned out to be a combination of professional software and hardware and an unobtainable piece of equipment (you can guess what it was from my signature list), he found it for me, and even negotiated with the software manufacturer for a highly discounted license, since I wasn't using it in a standard professional mode. He has found other consultants who have taught me how to use complex equipment and software and even build custom switching equipment, when none was available commercially. For those, he has taken no fee or commission from the other consultants. I thank him and refer other customers to him, but also reward him when I wanted to buy some relatively expensive equipment (the Audio Desk Vinyl Cleaner and AK120) by paying retail and local sales tax (helping the state but not him) where I could have saved a few hundred going to an internet dealer. He is also very free with loaning me equipment to test out or even to use for an extended time. I currently have some relatively expensive cables that I have borrowed from him for about three years, that he isn't using. Eventually I will either buy them from him at a big discount or return them if I find something better at a similar price point. He has also loaned me computers for several months to test out different software.
In the end, my enjoyment of music and my system has increased much more than the savings I would have had.
Larry