Do you really need a Rolex watch in your life. The amount of watches that are out there which are so much cheaper than buying a Rolex is substantial. However, if you're looking for a watch that closely resembles a Rolex Submariner in appearance, works well, and at the cheapest possible price, a serious contender has to be the Invicta Pro Diver (Seiko NH35A Automatic movement).
Yes, it's certainly not as refined and nowhere near the high quality of an original Submariner, but for the low price its actually a great alternative for those who don't have much money to spend but still want something that looks similar to a Rolex. Put them together, side by side in comparison, and you'll have to look closely to see the difference.
There's also some that look very similar to other Rolex models, such as the Sea-Dweller and Datejust. If you want one of those look for a brand called Pagani [Lot's on Amazon]. They are pretty decent. If someone is looking from a distance, it would be hard to tell if what you were wearing was either a Rolex Submariner or an Invicta Pro Diver [8928OB].
Yes, you could say, and many do, that the Invicta Pro Diver is a replica of the Submariner. And for the most part, it is! But its not an out-and-out fake or a cheap copy like much are out there. It does have its own brand name, Invicta, and they do take some pride in their workmanship. Much more than the many run of the mill no-name Rolex replica's that flood the marketplace. No, this is good quality watch for the price.
In fact some reviewers actually own both and have done some comparisons. A few even conclude that there isn't really all that much difference when it comes down to time accuracy and in some cases, even how it feels on the wrist.
Of course, the biggest difference between the two is not only the price, which is huge, but also the fear of damage, or lack thereof that comes from wearing the Invicta over the Rolex. Superb little timepiece. The only downfall is the aftersales service, which going on what a few customers have reported isn't that great.