Both Final Destination 4 (known as Final Destination3d...the one that starts with the racetrack scene) and Final Destination 5 (the one with the massive Bridge sequence) are both "available" on 3d blu ray. You can find them both on Amazon (new and used offers), EBAY and AmazonUK. After a quick search, I would reccomend going with AmazonUK (just type amazon.co.uk into your address bar). You can log in with your same U.S. site Email and Password. They currently have FD4 3D for about 18 GBP for the 2 blu rays and around 5 GBP for shipping to the U.S. With the VAT fee, you're looking at about $30 for the 2 shipped new to your door in the U.S. (The UK site will convert everything to U.S. Dollars for you on the final page of your cart(or whatever country you're in) If you want the cheapest route, I would just search FINAL DESTINATION 3D on Ebay and get them used.
Hope this helps.