Spotted this one on JayIsGames
http://jayisgames.com/archives/2009/05/free_games_from_big_fish.php
Big Fish has done this in the past (that was how I got Azada the last time, this time I picked up Hidden Expeditions). The coupons listed in the blog entry are good until the end of the month.
A rundown of each:
Azada: a collection of logic games of various types from memory to Mastermind to matchstick and more, plus a few semi-sorta hidden object related. Nice presentation overall even if the plot is kinda shakey (but that's incidental) You have a time limit, but I found it to be more than sufficent to solve everything. Kinda short (you can beat it in a couple of hours) so I doubt I'd have pay full price for it, but as a free game, very worth it.
Hidden Expedition: your basic hidden object game. Playing it after work. Not bad.
Spa Mania: Resource management. Have not played (I generally dislike resource management games)
Fairway Solitaire: Methinks it's card game or games. Have not played.
I think multiple coupons will work. Follow the instructions in the blog post.
Enjoy!