Dedicated macro lenses are quite expensive, but you can use your 50mm lens innovatively to shoot macros too. You will need to buy or make a reversal ring (an inexpensive and easily available attachment) that will allow you to mount your lens in reverse. You may not be able to use autofocus, but this is a great, affordable alternative if you wish to shoot flowers, insects or other tiny subjects.
Photograph/Akash Bhattacharya