http://www.olimex.com/ is a manufacturer of microcontroller boards and accessories at very interesting prices. Amazing customer service.
SeedStudio is the maker of a lot
of interesting hardware including pocket-size oscilloscopes.
http://sugru.com// sells a silicone-like putty which can be formed by hand, and becomes a flexible rubber in less than 24 hours.
Useful for small repair jobs (cables, keys, etc.)
Extremely cheap (about 12 € for a bag of 12), excellent customer service.