Walmart has the LEGO Ideas The Big Bang Theory Kit for $48 with free shipping. List price: $60. Features seven mini-figures (including Penny, Raj, and Amy Farrah Fowler).
For Prime members, Amazon has the Nerf Doomlands Vagabond Blaster for $12 with free shipping. Walmart sells it for the same price.
Ends Today. Amazon has the Be Amazing Toys Big Bag Of Science for $19 with free shipping for Prime members or on $25+. Retail price: $40. Has excellent Amazon Reviews.
Amazon has the littlebits Droid Inventor Kit for $79 with free shipping. Includes all electronic blocks, Droid parts, 9V battery, and free app.
Walmart sells it for the same price.
eBay has the Sphero R2-Q5 App-Enabled Droid (R201QRW) for $100 with free shipping. Retail price: $200.