We see a lot of people asking for part numbers for DigiKey, Mouser or other big electronics stores.
When you're working with hobby electronics, you don't necessarily need the most expensive components with the best quality.
Most of the time, it is more important to actually have the component value at hand when you need it.
We are big fans of buying really cheap component lots on eBay. You can get assortments of resistor, capacitors, transistors and everything in between. If you buy these types of assortments, you will almost always have the parts you need in your part collection.
For 17 USD you can get 2000 resistors of 50 different values. Great value, and very convenient.
Try doing som eBay searches and buy some components for future projects!
Another one of our favorite stores is Futurlec (http://www.futurlec.com/
). They have everything you need. The thing they don't have is 1000 different versions of that thing that you need, so browsing their inventory is a lot less confusing than buying from those bigger companies.