The Den currently have a "Spend $200 and get $20 off" promotion. The discount is applied automatically at checkout for orders over $200.
Cheapest I could find elsewhere was $38 pb @ Epicure but epicure have additional charges for delivery.
The Den requires a membership or an invite from a member.
96pt Stonier Reserve Pinot Noir 2013 $33.92pb in 6pk, or $30.58pb for new members with $20 referral credit. New members receive a $20 credit when referred (as does the referrer), and this additional $20 credit can also be applied at checkout.
See the wiki referral page for a list of users with invites.