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I've noticed a few folks on LMR have mentioned their preferred vendors -- I though I might do the same on my blog. There are more I'll probably add, but these folks are fresh in my mind. Everyone already knows about SparkFun, Adafruit, Electronics Goldmine, SeeedStudio/NKC Electronics and Gold Phoenix PCB -- this list includes stores I haven't seen mentioned.
__General-Purpose Vendors__
Drill and Mill Bits: Drill Bit City at http://drillcity.stores.yahoo.net/ -- this vendor was recommended in an Adafruit/Ladyada tutorial on PCB making, and I've ordered a few sets of drill/mill bits from here.
Copper-Clad Laminates: abcfab @ ebay -- http://stores.ebay.com/PCB-Laminates-Copper-Clad -- I think this fellow cuts up boards and sells them. I just got a brick of 4"x6" SS boards that I can trace/drill -- 50 for the price of 6 at my previous shop.
SMT Components: vakits.com -- This fellow in Florida has 805/1206 SMT components in small quantities for hobbyists to get started on. I picked up a resistor series, a capacitor series, and am thinking of getting some more parts and a hot plate (a la SparkFun) and doing my next projects with SMT. Orders >$35 ship free to the USA.
DIP IC Sockets: dipmicro @ebay or www.dipmicro.com -- 20-pin sockets and other stuff, from Canada
Tayda Electronics: http://www.taydaelectronics.com -- L297/L298 motor controllers on the cheap. Mouser wanted $11.50 for an L297, Tayda has them for $3.25. L298 is ~$2. Thank you, Tayda (ขอบคุณ (khorb koon))! Thailand FTW!
iPod Repair: http://www.digiexpress.us/ -- great site, nice videos -- fixing a smashed iPod screen ($44- incl. S/H) with their video instructions helped get me playing with other electronics (I placed my first Adafruit order shortly thereafter).
__Specialized components__
Minebea PM42 Motors: cpr05 @ ebay -- $2/pc, plus shipping. These are on my CNC.
ATX Power Supply: TRW Swap Meet in Redondo Beach, CA -- go in person, and if you can find the vendor, $5 buys you a 20-pin 300W ATX PSU with a warranty.
More to come