Update: There’s some reports that people are having success with getting this set for BOGO 50% off at the Toys R Us eBay store. With BOGO, you’ll be looking at savings of about 47% off (assuming you buy 2 sets of equal value). Excellent deal if this works! (thanks c4dreams and Dave)
For today only, Toys R Us America will be offering their exclusive 66473 LEGO Star wars 3 in 1 Super Pack for $99 (reg.$139.99). Savings work out to be 29% off which is not bad, but you do have to buy all 3 sets together. The included sets are the AT-TE, the Tank Droid and the Homing Spider Droid which together normally retails for $139.99.
Thanks to forum member Nepenthe7 for the tip.