Yes, I joined and they do sell the Q&C vouchers for $11.50. The catch is that they have a monthly membership fee that can range in cost from $14.95 to $24.95, depending on what sign up portal you used. If you're lucky, you can get a 30-day free trial and cancel the membership before the 30 days are up to avoid the monthly fee.
Another good source is
Hotwire Savings Club . They offer the same stuff as Simple Escapes, are run by the same company, have the 30-day free trial right on their site and only charge $7.95 per month if you decide to continue as a member.