Depends on the TE really, as well as which pack it is you are picking up.
RF / RD two pack is probably the more valuable out of the 3, ballpark current trade value of about $25 - $35US, depending on who is looking for it.
Rarity Carriage / Star Swirl I would say around $20 - $25US, as it's still around in most countries that had it.
And the RD / Sky Wishes I have no clue, as it's new its hard to guage what people are willing to pay for it.