If you were on the $6/mo for 6 months plan and last month's bundle was your 6th bundle there's a chance you still have the coupon in your Humble account and it MAY work for this bundle (effectively making it the 7th month).
My coupon was listed as expiring June 4th so I went to claim one of the games from this Monthly Choice and it took the $6 off for me so I got this month's bundle for $6 plus tax. I imagine it worked since I unlocked and paid for the bundle right away while the coupon was still technically valid.
Just an FYI in case anyone was interested.
Well, now I'm sad I didn't try that before cancelling my subscription on that account. At least I can still try to get the pause discount on my Classic account.