Hello,
What Megazord25 said is correct, we are not offering a free version of UE4, but the UE3 UDK is still available for free. However, you only ever have to pay for the editor once, then cancel your subscription’s reoccurring payments. This will allow you to use the engine for as long as you need for $19. For more information, please see this post with an official response from Mark Rein: Other special licenses? - Platform & Builds - Epic Developer Community Forums
Cheers!