You can google these things but my experience is that a motherboard with more slots is cheaper and works every time.

What's my answer? No. Don't do it. Get another motherboard or don't do it.

Yes, you wrote you can't afford a motherboard but as these expanders cost as much and are usually going to not work with high speed boards like video capture cards, you should stop right there. I would not look further into this unless you have money to burn.