Hmmm.......I'm not sure I understand your question. Do you mean where can you get that particular bicycle model? Can't help you there. Don't recognize the bike.
But if you mean, "Where can I get a bike like this?" then you're in the right place! You can learn all about them here. Just read these threads and you'll learn how to build one and you'll learn where to get the engines and such.
Have fun!