From their page:
"30 NEW Xpansion Tank 2 Libraries for SampleTank
Available in a Group Buy until May 31st!
EXTENDED UNTIL JUNE 6th!
NOW YOU GET 7 FOR 1
For Only €39.99/$49.99
PLUS you get the fully Xpandable SampleTank 2 XT with 1 GB of sounds FREE!"
Additional pack when buying from esoundz:
“Xpansion Tank 2 Group Buy NOW 7 for 1 plus EXCLUSIVE BONUS EIGHTH* LIBRARY!.”
That’s a pretty sweet deal, I think.