Link Delight is known for selling items that are the same as the big guys-minus the logo. I got an exact replica of a Canon battery grip (minus the Canon logo) for like $40 on there. When it comes to certain camera accessories, there is absolutely no reason to pay a lot of money.
However I am one who feels monitoring is important, so I bought a Z-Finder. I could do just as well without one, but that wouldn't be as much fun. Viewfinders are great for pulling focus while recording, since you can't enlarge.