Tell us about yourself!
I'm sure the evive is a fine microcontroller\platform, but using an example of a pair of controllable sunglasses that make you completely blind when the shades are down due to the LED stripes and saying how it would be great to block out that hot sun when driving........don't mean to be negative here, but you may want to rethink your sales example.
this is a great document on how one could "possibly" build this idea, but I'm wondering exactly what you built for that $300 price point. Pricing this out according to your suggestions, and this build is nowhere even close to the budget $300 you describe.
Raspberry Pi: Wall Mounted Calendar and Notification Center
Making ApplePi, Merging a Vintage Macintosh Plus With the Raspberry Pi
RPi Christmas Lights
Bug Sprayer = Hair Salon?
Multiplexing with Arduino and the 74HC595