Most condo complexes include insurance with their condo fee. However, many owners decide to get insurance for their personal belongs, ie furniture, jewelry, etc. and the cost will depend of the value of what you wish to insure.
If you have any more questions, please do not hesitate to contact me.
You first need to determine if its needed. The association is covered under a master policy paid through the condo fee. If the master has "walls in" coverage nothing more is needed. If not then you need an HO6 policy for personal property which is similar to renters insurance. 300-500