Radioshack needs to jump on the Maker movement, Right To Repair movement, and science education movement. Offer everything from 3d printing classes to how to fix classes. By educating the masses, you create demand for your products you're selling.
I just need a single 100uF 100V Electrolytic NP Capacitor
Yeah, it is the shipping that is killer. You are doing some hobby project and find you need a capacitor or resistor that you don't have, and then you either order just what you need and pay 10x on shipping, or order a whole bunch of them hoping that someday you'll need them, or you find other things you also need or might need someday to add to your order.
It's particularly annoying when I just want a few cheap parts that are all thin, weigh practically nothing, and are not fragile. Why can't Mouser or DigiKey just toss them into an envelope, put a first class stamp on it, and mail it? I'd be willing to accept the risk and eat the loss if somehow the post office manages to break my resistors or capacitors.
What I've done for resistors and capacitors is order some kits that contains a bunch of them. I got a resister kit that has 860 resistors (10 each of the E12 values from 0 to 10M ohm), and a capacitor kit that has 645 capacitors that has a range of ceramic and electrolytic capacitors, with 30 each of the most common values and 10 each of the less common values.
I've also got a 600 transistor kit (15 common types, 40 each), and a 220 piece inductor kit (22 values, 10 each).
The particular kits I bought aren't available anymore, but as an example here's a currently available 1280 piece resistor kit for $11 [1].
The kits will probably have all the resistors, capacitors, inductors, and transistors I'll need for a while, and if I do end up using all of a particular value from one of the kits I'll then also know that is a value that is worth stocking up on.
[1] https://www.amazon.com/Resistor-Assorted-Resistors-Assortmen...