I've seen them on discount sites like Zulily and Woot pretty regularly recently (though if you're wanting them for the holidays you'd be cutting it close).
We have Snap Circuits. Rainbow Resource has a good everyday price for them. I'm sure when they go on sale at other places they're lower sometimes, but this site generally has the best everyday prices on the games they carry, and I love their selection.
Snap Circuits are great!! I bought them for DS years back based on a thread here. He loved them! I teach 6th graders and use them as reward time. Many of the boys & the girls love them too.
Thanks for reminding me abut this. I wanted to get one for my DD and DH to work on together. Target also has them online for about the same price as the site mentioned about. It will be cheaper thru target after my redcard and ebates!!!!