...
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 that the team has used
Eggtimer: Solder-yourself kits for rocket electronics
Help! LiPo suppliers?
Chutes
...
Fruity Chutes: Chutes of many sizes.
Top Flight Recovery: Cheap, but still high quality parachutes