Equipment, test leads, tools, and prototyping
Goldcrest Electronics keeps engineers, technicians, students, and hobbyists supplied with parts from capacitors to tools. You won't find many stores like it anymore.
While Goldcrest is mostly a components shop, I did find some equipment such as this Lambda power supply.
While I didn't see any multimeters during my visit, I did see these test leads. You never know when you'll lose or break your leads and need replacements.
Try constructing any engineering project without pliers. You won't get very far.
Screwdrivers: You can't live without them. What would you do with a 100-piece screwdriver bit set?
Build your low-frequency circuits on a prototyping board. Once you design your PCB, you can use ferric chloride to etch the traces.