These aren't kits, as much as they are an inexpensive bag of components so you can build yourself a Symet.
For true DIY, hack the included cassette mechanism into a solar-powered device using the high performance Miller Solarengine which converts light into impressive bursts of energy! Rapid fire, SCC2433-MSE version.
Herbie the Mousebot is a very quick, easy-to-build, light-chasing robot kit with functional whisker and tail sensors!
This epoxy-encapsulated monocrystalline solar cell generates a nominal 4.5V / 18mA (sunlight) from a 24x33mm package. And has an integrated solarengine circuit board!
This big brother of the SCC3733 is also an epoxy-encapsulated monocrystalline solar cell, but this one offers 8 volts and 44mA in a 37 x 66mm package!
We had Grand-Wing Servo supply us with an inventory of their modified GWS05 servo! It's a servo without pcb - all brawn, no brains!