Expecting to buy a handful of Chaos Legion Pack during the opening of the presale, I got disappointed to learn that you need a voucher to purchase the said packs. But this did not stop me from searching for other ways to buy those packs as early as possible, so I went hunting.
The secondary market
I found atomichub.io selling a Chaos Legion Pack for $23 and bought 1 only to find out that it is now $14.98.
I also discovered that Hive Engine is selling vouchers for $23. This adds up to a $27 Chaos Legion Pack. Just a while ago Hive Engine sell chaos Legion pack at $9.47. Yesterday, it was $23, then $19, and went down to $9.47 this morning October 20. Let's hope it will still plunge down to only $4 (fingers crossed). See the illustration below.
I hope this post will help you in searching for the pack/s that does not need vouchers. Please comment down below if you found cheaper pack/s.