at walmart
You can't get it in a pack.
This may be a factory error. Check your parts list-- perhaps a hero was supposed to be included, but in fact wasn't. If this is the case, Lego.com's Customer Service page has an area to report a missing piece with a new set.
the hero pack
You can get Elemental Hero Sparkman in Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia from "The Lost Millennium" pack or his card code 20721928.
Lego star wars spider droid
Major retailers like Walmart and Toys R Us carry Lego toys including the Star Wars pack. You can also find the Star Wars Lego pack online at Amazon and eBay.
its hidden
The Lego Star Wars Jedi Mission Battle Pack is not a real set and is not sold anywhere.
Lego Shaak Ti is in the LEGO 7931 Star Wars T-6 Jedi Shuttle set.
Elemental Hero Sparkman can be found in the booster pack, "The Lost Millennium".
About $11.00 USD