Same videos as abashamen posted, except these are in 1080p instead of 720p.
[A bit of a coincidence we posted the same videos on the same day, as I was actually filling a request from someone elsewhere before even checking this thread]
Two face swaps from swapface. Gives you 10 free swaps for pictures and 10 free swaps for videos per day. Only needs one picture
If you use this reference when you sign up you'll get some free credits too. Really simple to use.