Solar / general kits:

http://store.qkits.com/

http://store.sundancesolar.com/ | 1

http://www.acroname.com | 1

http://www.bpesolutions.com/lghtefx.html

http://www.cirkits.com/ | 1

http://www.electronickits.com/

http://www.elexp.com | 1 | 2 | 3

http://www.esssales.com/ | 1

http://www.gleasonresearch.com/prod.php?sku=SMKIT

http://www.herbach.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=HAR&Category_Code=KIT

http://www.hobbyengineering.com | 1 | 2

http://www.hobbytron.com | 1

http://www.hvwtech.com/ | 1

http://www.junun.org/MarkIII/Store.jsp

http://www.kingsolar.com/catalog/mfg/other/edukit.html

http://www.kitsrus.com/kits.html

http://www.makezine.com | 1 | 2

http://www.plastecs.com | 1

http://www.powernaturally.org/Programs/SchoolPowerNaturally/InTheClassroom/kitlessons.asp?i=9

http://www.quasarelectronics.com | 1 | 2

http://www.robotikitsdirect.com/

http://www.robotstore.com/ | 1 | 2 | 3 | 4

http://www.robotstorehk.com/scientifickits/scientifickits.html

http://www.sciencekits.com/ | 1

http://www.scientificsonline.com

http://www.siliconsolar.com | 1 | 2

http://www.solarbotics.com/products/index.php?search_id=8

http://www.techkits.com/

http://www.therobotstore.com | 1

Sensor kits:

http://www.bakatronics.com | 1 | 2

http://www.hobbyengineering.com/SectionS.html

http://www.mindtel.com/mindtel/sensors/sensors.html

http://www.parallax.com/detail.asp?product_id=30056

http://www.therobotstore.com/s.nl/it.A/id.169/.f