I'd like to connect two monitors, and run off both of them without using the main laptop monitor (it's too small to bother with once I've got the 17" ones attached).

I have only one monitor port.

Is it possible to get both monitors connected? If so, what's the cheapest way of achieving this?

I've seen other posts relating to multiple monitors, but don't know how to tell what applies to my laptop, and what doesn't.