Jaycar Electronics might not be the place where you find the cheapest gadgets, but it is one of definite site to go to when you want to build your own gadget (yup, I know there are quite a few real engineers out there!)

For the month of March, Jaycar is running a March Madness promotion, where all items attract a minimum 10% off!

From their website:

Enjoy a minimum of 10% off on ALL items from 1^st to 10^th March and Up to 50% off selected items for 30 days. Applicable to Australia and New Zealand only.

You can find their sale items in PDF form here.