If you can do a search on Amazon you should be able to see the huge selection of 3D BD out. The prices range from about $12 to a hundred based on the number of disks in the multi disk sets and the private party sales for exclusives. I've seen Avatar 3D go for $100 on ebay auction. The new releases are coming faster and faster now and I am averaging 3 new releases a month of titles I like. Just got Cars 2 which is a 5 disk set to include 3D, BluRay 2D, Special features in BluRay, DVD, and digital copy. I recall my price was around $24. Prices vary but average is about $30 for the set. Watch out for sales and coupons.
If you are planing on getting started in 3D, be sure to get lots of demos as 3D is special and not everyone can see it without side effects such as headaches. Most of the titles out are quite entertaining in 3D but not all. Good reviews on AVSForum by Ralph Potts.
Don't pay any attention to the Trolls who chase after people interested in adding more entertainment to their lives with 3D who try to convince them 3D is going to die soon. Their agenda is dubious at best. I feel sorry for therm. If you find 3D entertaining, I can assure you a good home system will be even better than what you see in the theater. If you found 3D annoying in the theater, then probably the home experience won't help. Some people just find it irritating and that's OK, 3D, as I said isn't for everyone, just like a PS3 game machine isn't for everyone. One thing is certain, if suddenly these trolls get the government to pass a law outlawing 3D, your investment in it won't be wasted because these 3D systems are superb 2D players and screens.
BTW- the library of 3D content in addition to Blu Ray is growing too with Satellite, cable, and internet content. Blu Ray 3D is the best of breed, however.
If you are into home video, you will be pleased to know that more and more camcorders are being released for shooting 3D content. These can play back 3D video in BluRay like quality direct to your 3D TV.
Next two releases are Spy Kids 4 on Nov 22 and Smurfs on Dec 2. The 3D release titles is growing faster than blu Ray did at the same time period.