you get the voucher immediately. get your brookstone order ready now and see if it is in stock still. Takes about 5 minutes to get the coupon, I think you are ok. I ordered 2 tonight.
Here's the group on link
https://www.groupon.com/deals/brookstone-152-chicago?z=skip&utm_medium=afl&utm_source=GPN&utm_campaign=200760&mediaId=315347
I do wonder if they'll honor it because everywhere else there is a specific note about this product not being coupon eligible.
I'm also not a Groupon member, which is the only way to 'see' the coupon.