Cdkeys.com has Minecraft DLC packs Creator, Starter, and Explorer packs for Xbox One from $0.99-$1.89. I received the codes immediately and they added to my Xbox Live account without any issues.
Creators Pack $1.69: https://www.cdkeys.com/xbox-live/…one-cd-key
Starter Pack $1.89: https://www.cdkeys.com/minecraft-…one-cd-key
Explorer Pack $0.99: https://www.cdkeys.com/xbox-live/…c-xbox-one