HDMI 1 in 3 out splitter that extends

How far away will those monitors be?  HDMI has a limited cable length and if the run is over that length then more expensive equipment (more expensive than a simple 4-way splitter) is required.

I did a search on Amazon for "HDMI splitter" and got a number of results.  This one is $40:
https://smile.amazon.com/OREI-UltraHD-HDMI-Splitter-Port/dp/B07HR1WD4S/ref=sr_1_1_sspa?keywords=hdmi+splitter&qid=1581977001&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFYSFg1WTFMOUxCNUgmZW5jcnlwdGVkSWQ9QTA2MjQ1NDBLUFE1WTkzODdPSkwmZW5jcnlwdGVkQWRJZD1BMDQ4ODE4NDJSNVkxOTlDVUo2TlYmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

CompProbSolv, I went to the link that you provided and it looks like it only does duplication.  The splitter that I want needs to extend where it will be able to show me different displays on each monitor and not duplicate the displays.

I get the impression that what you want is an HDMI adapter that goes into a PC, which has three or more independent HDMI outputs.  Would that be the case?

The Radeon 5570 is an example of such and is modestly priced at $180.

https://www.amazon.com/VisionTek-Radeon-5570-VHDCI-Graphics/dp/B01N3QHCIN

You are correct.  I misunderstood your use of "extend" though it was correct.

I don't believe you'll find what you want as a splitter.  You really want 3 new HDMI ports.  Is this on a desktop or a laptop?  If desktop, then you'd be looking at adding 1 or 2 video cards to get the extra ports.  An alternative would be to use a universal docking station that will add the monitors from a USB-C or Thunderbolt connector.

What I want to do is extend my main screen across multiple monitors (3).  After I plug the monitors into the splitter below are the instructions that I would follow to extend the displays.
On the Windows desktop, right-click on an empty area and select the Display settings option.
Scroll down to the Multiple displays section.
Below the Multiple displays option, click the drop-down list and select Extend these displays.

What Dr. Klahn suggested (Radeon card) should do the job as long as you have a suitable place to install it in your computer.  It would be a better solution than a universal dock if you are able to use it.

I have a laptop computer.

Running Windows 10.

I was hoping I could get away with a HDMI splitter for my Windows 10 laptop.  Would this not be able to be done with a splitter?

thanks fo all the comments.