Housing in cartagena

Hi can anyone recommend suburbs near cartagena? I lnow living in cartagena is really expensive but i was wondering prices and good locations of suburbs or towns near cartagena that are reasonably priced?
Ive been also looking at Santa Marta. But truly would prefer near cartagena.  Also prices to rent and or purchase. We want to rent first to make sure we are happy there before purchasing. Any suggestions and help would be grately appreciate.

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