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A while back someone posted on here that he was... taking a class where he was learning to write software that would read documents? ...something like that. Anyway, he tallied up all the components used in madbean projects. I couldn't find the thread but I saved this. It should give you some idea of what values are the most common:

Whooaaa, this is exactly the kind of thing I was looking for. Sounds like he built a web scraper that could sort output into a table. Very cool. If you happen to find the thread, I'd love to see it! But this is excellent. Thanks!

Couple things I'll add:
If you go the route of buying parts based on the project(s) you'd want to build, it's good to buy more than you need—within reason.

Resistors are typically pennies, so no real harm there. Caps hover around 10-20 cents (US) each, so use your own judgement there. Some other common parts like barrier and schottky diodes, certain silicon transistors, and others are inexpensive.

I'd sort out some part storage if you haven't already—doesnt need to be fancy. Be aware that nearly all partitioned plastic bins are not ESD safe, so things like ICs, transistors, and diodes should be stored in ESD bags (not the pink or blue ones, but real mylar-looking ones, though they aren't actually mylar).

Man, thank you so much for all the info. Hugely appreciated! I'll check out the stores you mentioned and stick with them for parts when possible.

Your idea of buying parts based on projects and buying more than I need is exactly what I'm thinking. I figured I'd order a few boards from MBP, a few boxes of different components in a range of values, and then go through the BOM of each pedal and see what else I need, ordering more than needed if it makes sense.

Huge thanks for the tip on ESD storage. I hadn't thought of that. I just finally started upgrading my small parts storage/hardware to the Gridfinity system and thought I'd be using that for the electronics components but hadn't thought of ESD safety. I guess I'll have to rethink that for a moment!

As far as experience/skill with component soldering, I still have a long way to go. I've only replaced individual components one at a time, and only done one or two SMDs. I did an IC once where the solder joints had evaporated, but man, that was a freaking challenge. I can at least say I've done a better job each time, but building a single board will be more components at once than I've done in total previously. Absolutely up for the challenge though.

Hey everyone!

New here and so stoked to have found your community. These pedals are totally the projects I've been looking for. While I think I'm a relatively well-rounded maker (machining, welding, 3d modeling, powder coating, woodworking, etc.), my electronics skills need a lot of growth. I have a decent soldering setup and bench-top power supply and have done plenty of minor electrical repairs over the years, but I'd love to get deeper into some actual builds. I've been meaning to do some projects like the DIY synth modules from Erica Synths, but I think stop-boxes are a more practical endeavor for the moment. 

One of the things I've been meaning to do is build out a decent kit of basic electronic components and I was hoping you guys could give me a list of items I should keep on hand. I'm thinking resistors, transistors, capacitors, diodes, etc. Maybe some pots and jacks as well. Not sure if I should just grab small kits off Amazon or put in an order on Mouser/Digikey but I'll take whatever recommendations you all have!

Thanks in advance!