Any need for 4K, or just 1080p?

Not local but I purchased two of these from Amazon and only ever used one of them, it always worked seamlessly, only supports 1080p however: https://www.amazon.com/dp/B00EO1GMNU/ref=pe_385040_30332190_TE_M3T1_ST1_dp_1

I suspect the key is just making sure that they're compatible from a technical perspective (max resolution, HDCP etc.), otherwise they should all do the job OK.

I just have a cheap Transonic 4-to-1 I picked up for $10 in the clearance bin at The Warehouse several years ago - the only Transonic device that hasn't let me down. It works fine at Full HD 1920x1080 and auto switches in the priority order you connect.

There are lots on TradeMe as cheap as $15 including shipping.

HDMI switches on Trade Me

(edited to create hyperlink)

I have 4 of these. IR reciever is on a wire so can have them stuffed down behind all the consoles and stuff, and I have one of the left of the TV and one on the right so I can change them by aiming the remote at the IR reciever for the one I want to change.

USB powered, but I find its not needed. LEDs are stupid bright so some black electrical tape is needed to cover them.

@freitasm: A link on this page is stuffing the layout.

My HDMI switches are the cheapest I could find on Aliexpress. They have always worked perfectly for me at 1080p and still do. 

Depends what you are trying to achieve.

If you don't need 4K now then I would suggest just getting one of the cheap as chips 1080p models. Given how little they cost, you won't have lost much if you decide to replace it with a 4K one later.

Depending on your setup and use cases, it might also be worth paying extra to get a proper matrix splitter. 4x2 matrix splitters aren't that expensive in the scheme of things, and let you route any input to either or both of two outputs. Which is handy if you (say) might want to use an HDMI-over-ethernet solution to route your Sky box or other video source to a bedroom telly as well as the main telly. Also handy if you want the ability to route inputs to a capture device as well as the telly without swapping cables.

Thank you all for your helpful replies. I will look at getting a cheap 1080p one for now and see how that goes with my setup.

Cheers