The prices are quite low but it's hard to decide whether or not I should aim for the actual chaos legion deck or the reward cards. I think the pack cards are more expensive now compared to the reward cards so the reward cards are better for the rental market (legendary). However, I have noticed a lot of undercutting for level 1 epic and rare cards.
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My personal opinion I would go with getting rewards over chaos. Most of those in print reward cards are 2/3 distributed. They will likely be out of print sooner then the chaos packs being sold out. In addition like you said rewards are cheaper than chaos. I am slowly maxing all my chaos reward cards while adding only level 1 or 2 chaos cards when I see a reasonable sale.