How to use more than one port as mirrored port in any Ethernet switch

I want to feed packets from a mirrored (SPAN) port of Ethernet switch to two monitoring devices at the same time, hence both the monitoring devices gets exact same set of packets.

I can think of using a simple Hub to which the two monitoring devices and the mirror-port of the Switch are connected, but this becomes expensive.
I may need packets from same set of source ports to be copied to multiple destination mirror (SPAN) ports. I am using a Cisco managed switch which gives me option to chose only one destination port and multiple source ports.
Are there any other ways to achieve this?, or can I configure a Switch to choose multiple SPAN ports?.