Is it common to get MRSA again after you have it once?

Can happen. Possible to develop recurrent MRSA infection at some point in the future after having had MRSA infection at a different site on your body. There is some evidence that a patient who has community-type MRSA infection is more likely to have recurrent skin infection than a patient who had a non-MRSA staph infection.
Yes. If you are colonized with MRSA ( nasal colonization), it is possible to have it again.