I searched for the most recently ended auctions that sold...
FA Shaymin EX - $18-20
$23ish - link
$18ish - link
$20 - link
Terrakion EX - $11ish
$8 - link
$11 - link
$11 - link
promo Darkrai EX - $8-9ish
$9 - link
$6.50 - link
$8.50 - link
I found some FA Shaymin EXs that sold for $12ish but that was a month to 2 months ago so I don't consider that current price.
I will pass. Depending on what $4-6 cards they are, my offer is still on the table. If you decline it, I appreciate your time.
I just got one from another trader. Thanks for the offer!