Here's my experience with pedal building. Take it or leave it.
My first build ever I bought a kit from General Guitar Gadgets. It was a tube screamer clone and was about $50 US. Everything was included (enclosure, resistors, capacitors, PCB, IC, wire, knobs, jacks, etc.) minus any enclosure art you may want to do. I would highly recommend finding a kit out there for an effect you like just to get your feet wet in the process. I don't say love since those effects tend to be very specific and kits aren't available. The good news about kits being generic by nature is that there are a TON of troubleshooting forums for them including here. Once you are done making it you have to decide whether or not to go down this rabbit hole. Some people don't have the patience or get too frustrated during the build or troubleshooting process.
That being said, if you DO want to go down this road....
I decided after my first build that I wanted to make more and enjoy this hobby. I looked online at various sites for PCBs to start my next build. I think I wanted to do 2 or 3 at the time. PedalPCB has been my go to for PCBs and Tayda has been my go to source for 95%+ for all parts. Mouser is a bit too complicated of a site if you're not quite sure what you are looking for. There are higher quality parts out there on different sites, but you will be paying more per part plus the cost of shipping for each vendor. I am not saying that Tayda sells garbage - I'm just a cheap @SS. Looking at the build docs for these builds I created a shopping list on an excel spreadsheet (yes, I'm an accountant lol) to determine how many of each part I needed and it's value. With tayda, certain parts you can buy individually such as ICs or transistors and certain parts like resistors you have to buy in sets of 10. My recommendation is to ALWAYS buy extra of what you need in case you get a bad part and over time if you buy enough extra of everything you can build a "free" pedal, meaning you don't have to make an extra shopping list.
Regarding your "bundle" question...
Yes, the dreaded Amazon does sell bundles of various components (set of resistors, set of capacitors, IC, transistors) and I did consider this for a while since it would be kind of a one stop shop for a type of component. The problem with this (resistors and potentiometers come to mind) is that you will run out of certain values quicker than others and some values you most likely won't use at all (a 1 ohm resistor comes to mind here). The only thing that I did buy on Amazon that I did like was some hookup wire that came in different colors (VERY helpful when troubleshooting). After a few builds I got a sense of what parts I used frequently (1k, 10k, 100k, 1m resistors) and those that were kind of a one-off (5.6 nf capacitor) for a particular build. You will have to use your own experience here to determine this since we all have different tastes in effects. In general I am very please with Tayda and would recommend for anyone just starting out. Considering the shipping time (I'm in the US and delivery time is about 2 weeks for me) It is incredibly worth taking the time to make up a shopping list. Otherwise your build will be put on hold until your next delivery happens.
Just my 2 cents...
