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If you do a significant amount of restoration work it might be worth keeping stock of various values. My initial resistor stock were parts I scavenged off boards and an assortment of NOS carbon comps...I got sick of the NOS carbon comps being as far off tolerance as the ones I wanted to replace so I got a ~$40 1W Yaego or Vishay resistor kit off of Digikey that had 5 each of a ton of resistance values between 6.8K and 1M...I originally meant to order a 2W kit but somehow goofed. They have other kits in both 1W and 2W that cover 62 ohms to ~6K. Eventually I had 4 of those starter kits sifted into drawer cabinets and whenever I would do a cap order depending on how few of a given value remained (actual demand) and how commonly I think I need a value (perceived demand) I order 10-100 of a given value/power to restock.
I don't have to worry about the long gratification of next day or next week shipping, my instant gratification is being able to blindly reach over to the side of my bench the drawers are on and grab what I need without pausing for a parts order.
On resistors my re-order point was initially when I had 3 left...On some common values 1k, 10k, 100k, 1M if I hit 10-20 I buy more.
Caps I allow to reach "0" in my main stock and are usually the trigger for an order (I try to only order 1-2x a year and anticipate what I need to save on shipping... unless doing client work where parts and shipping are on their dime) and I allow them to reach 0 in my main stock because I have a glorified pill sorting box with about 5 of each value I use that I bring on vacations to do on the fly recaps of things I buy...I can usually use that as a buffer for the main stock. I need to make a resistor travel kit too. I should probably also keep a small box of most commonly needed tubes at the cabin too (there are spares for the radios that live there hidden in said radios) but that's a big undertaking cross referencing subs and guestimating what I'll find...
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