Umm... This is probably a really dumb question.... I use <other vendor names deleted> for electronics orders, why not try them? I know it's probably more expensive, but for caps, LEDs, resistors and such, it is a real gold mine. Not trying to tell ya how to run the business, but I do want to mention that, as a customer, I don't mind MadVapes markup on top of the <electronics supplier> prices if it gives me one stop shopping at MV. I know you have to order from China anyway......... But, it's just a thought on the "misc" stuff. At least you won't get held up in customs! Last I knew shipping was free over a certain amount.
I noticed the comment above about waiting for caps and Radio Shack not carrying stuff, and confiscated China orders,.....so I just mentioned it..... I'm pretty sure you would have already checked em out. Just thought you should know I don't mind the markup if it helps you to get stuff locally. Lots of posts about confiscation. If I have to order from them, I have to pay shipping unless I order in larger quantities, or have at least $25.00 (last I knew) where buying 1 or 2 pieces from you is handy.
EDIT: Realized it may be tacky, even if they are well know USA suppliers of electronics stuff, so I deleted the vendor names. Most people into electronics know em, but it's tacky.