Portable double & triple monitor for laptop

[BWillie]

I would like to be able to use my laptop wherever I go - but be able to use up to 3 monitors. Two would really probably suffice. I realize I can just bring a portable screen but it's not easily maneuverable and portable.

Something that mounts on your laptop semi-permanently that you can close and transport your laptop easily. Does it exist?

I've been watching the company Slide and Joy which has two monitors but it's $520. Surely there are more price competitive options for one slide out or fold out monitor. Anyone have one that just, works.