Walmart has Ozark Trail 14-Person 2-Room Instant Cabin Tent for $129.99. Which is a good deal especially knowing that Spring is coming. The lowest it got was $99 during Thanksgiving but its a good deal even know. Both Blue and Orange colors available.
I have this tent. It setup in a 5 minutes (12 min with rainfly and pegs) and is big. Probably not for 14 adults but will likely fit 8-10 people without issues.
You can get it shipped to you or order it to the store for free.