Target offers the Sphero Star Wars R2-D2 App-Enabled Droid for $165.99. Text "TOY" to "827438" to receive a unique coupon code that cuts it $124.49. (a_i_e_l via eBay charges slightly more.) With free shipping, that's the lowest price we could find by $41. This 5" droid features LED lights and a speaker with beeps and boops. It interacts with other Sphero Droids.

Also available is the Sphero Star Wars BB-9E App-Enabled Droid for $97.49 with free shipping via the same process as above. That's the lowest price we could find by $52.