Walmart has some thinkgeek Star Wars battery packs on clearance for $4. Super cheap for a battery pack and Star Wars so my inner geek bought one of each… There were a lot of them at one of my local Walmart’s so should hopefully be an easy find. As always with Walmart clearance YMMV and sorry ahead of time if you don’t find them… These appear similar to the black web ones with the LED display to show capacity.
Edit: looks like some are as low as $1… none in stock that show up.
White X-Wing:
http://www.walmart.com/ip/Star-Wa…/253060635
https://brickseek.com/walmart-inv…=25306063
Black Tie Fighter:
http://www.walmart.com/ip/Think-G…/292607168
https://brickseek.com/walmart-inv…=29260716
Black Deathstar:
http://www.walmart.com/ip/ThinkGe…/943810618
https://brickseek.com/walmart-inv…=94381061
Similar ones by blackweb look to be on sale as well…
10000mah rose gold $5
http://www.walmart.com/ip/Blackwe…/323472908
https://brickseek.com/walmart-inv…=32347290
10000mah Black $5
http://www.walmart.com/ip/Blackwe…/508154088
https://brickseek.com/walmart-inv…=50815408
6000mah Black $3
http://www.walmart.com/ip/Blackwe…/958086275
https://brickseek.com/walmart-inv…=95808627
6000mah White $3
http://www.walmart.com/ip/Blackwe…/320371686
https://brickseek.com/walmart-inv…=32037168
6000mah Rose Gold $3
http://www.walmart.com/ip/Blackwe…/550435901
https://brickseek.com/walmart-inv…=55043590
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