There were two Six Packs. The second set had a red background and included Rebel Soldier, Stormtrooper (Hoth Battle Gear), Han Solo (Hoth Battle Gear), Darth Vader, C-3PO, and R2-D2.
Note the markdown in the first photo from $13.97 to $5.00. The last photo shows a different set with a markdown from $17.95 to $14.96 ($2.50/figure, about the average when sold separately). The copyright date on the box is 1981, and the ESB figures first appeared in 1980, so the only thing I can think of to justify the $5.00 price is that everyone already had the individual figures by 1981.
2 Warps to Neptune 
I know Sears had an exclusive or two – I had one that came with a cheapie cardbord cutout version of the Bespin carbonite freezing chamber and four figures: Ugnaught, Lobot, Han in Bespin outfit, and.. Bespin Guard?
Nope, not Bespin Guard. It was Dengar. http://theswca.com/images-toys/figuretoys/cloudcity.html
That green price tag was from the greatly missed Best Products from my home state of Virginia.
Best was my favorite store, too! I thought about it because it said “self-service” on the tag, but the colors didn’t seem to match…
https://2warpstoneptune.wordpress.com/2012/03/19/when-kids-knew-best/