There are plenty of other online retailers. The guitar cable example triggered me, because even in the best of times you can get better gear from a smaller business with the same two day shipping. I'm sure there are tons of other examples.
Yes, if anything, this might benefit small online retailers. It is also worth noting, that many local stores which have to close during the crisis have turned into online retailers of some sort. You can call them and they will deliver to your house to keep their business afloat. So even if they don't even have a proper web site, it might be worth while to pick up your phone and give them an old-fashioned call.
