Suppliers

I have used the following suppliers:

Mouser: Large US-based supplier with excellent service. Small-order friendly. Highly recommended. Mouser doesn't stock the BMP085 pressure sensor.

Digi-Key: Essentially the same thing as Mouser, but I like their website a bit less. Prices usually quite comparable. Also recommended.

SparkFun: Small outfit based in Colorado. Very maker-friendly. Limited selection compared to the big houses above, but they also put out lots of very useful boards and breakouts and widgets that they make in house. Slightly more spendy. Highly recommended.

Satistronics: Hong Kong based supplier. Interesting selection, very cheap prices. Service is surprisingly good and responsive. Expect over a month of shipping time unless you opt for the much more expensive shipping options.

Futurlec: Another Hong Kong supplier. Interesting selection, including a bunch of in-house produced mini boards for very cheap. Excellent prices. Again, very long shipping time.

MPJA: Florida-based surplus dealer. They probably don't have what you want, but if they do, it'll be for pennies on the dollar. Always worth checking. Good selection of power supplies for not much money.