Toys R Us's latest offer is you get $20 off any purchase over $100-with some restrictions.
I checked and the Dark Starter Packs are eligible. Soo....you could get the dark starter pack for @$80. (Technically it's $99 so you may have to get a trap or something to push you over the $100 or speak to the manager
"SAVE $20 on ANY Skylanders Trap Team purchase of $100 or more (Restrictions apply)
Maximum discount is 1 per customer. Online offer: At least 1 item added to cart must be $20 or greater for discount to apply."-
ToysRUs Website