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Apogee Components: General parts. Comprehensive inventory, up to mid-range high-power. Good experience, but significantly more expensive.
Madcow Rocketry: General parts. Less comprehensive inventory, but a good competitor.
Wildman Rocketry: General parts. Less comprehensive inventory, but also goes all the way up to "the big stuff". Also a good competitor.
Public Missiles: Especially good for tubes on tubes on tubes.
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Estes: Primary supplier for A-E motors. These can also be found in some hobby stores. Avoid the larger (E and above) motors, as they have a very high failure rate.
Quest: Similar to Estes, but with a smaller market share.
High Power:
Cesaroni Technologies, Inc.: Our main supplier for rocket motors. Usually AMW/ProX sells their stuff and is usually on-site for MA/ME-based launches, . They very polite, occasionally difficult to reach. Factory explosion occurred Spring 2016, unsure of current status.supply will be limited for 8+ months.
Important notes: Vmax warning and Forward closure warning
Aerotech: Much less Less common supplier of rocket motors for rocket team, mostly due to shipping times.
Loki Research: Less common motors, but lots of interesting projectproducts. Not a lot of team experience.
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Someone fill in here, I don't know much about this.
APC Composites
US Composites
X-Winder?
Electronics
Sparkfun: Lots of electronics components
Adafruit: Similar to sparkfun. Also has great tutorials on using their products
Digikey: The McMaster of electronics components
OshPark: Sponsored us for PCB's in 2016. Quick delivery time, we can assemble the PCB components in lab.
Missileworks: Feature-filled rocket altimeters
PerfectFlite: Another company that makes altimeters (such as the StratoLogger) that the team has used.
Help! LiPo suppliers?
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Eggtimer: Solder-yourself kits for rocket electronics
Altus Metrum: High end altimeters for rockets which include telemetry and GPS.
Hobby King: Servos and lipos. Also lots of RC stuff should that be needed.
Chutes and Recovery Components
Rocketman: High quality, 4 shroud-line chutes. Different strength ratings, and descent rate table matching rocket weight to appropriate chute. Chutes also usually come with a loop sewn in the top, which proves incredibly useful for single-separation dual-deploy systems.
Fabric supplier????
Other sewing equipment suppliers??
Fruity Chutes: Chutes of many sizes.
Top Flight Recovery: Cheap, but still high quality parachutes
Tinder Rocketry: Sells Tender Descenders, which are useful for single-separation dual-deploy systems. The reliable of Tender Descenders is in question, but they have proven themselves in flight to date.