Range extender purchase recommendation

I have the Orbi Router (RBR750) Orbi Satellite (RBS750). However I need to extend the wifi on the basement and don't want to buy a whole satellite because it's to expensive https://epytv.com/

I have a Ethernet port in the basement. Which extender can I buy that matches well with model I have

If you have an Ethernet port in the basement, your best bet is to use a Wi-Fi access point or Ethernet-backed extender rather than just a wireless repeater. Look for a Wi-Fi 6 (or 6E) access point that can be set in access point mode and connected via Ethernet to your Orbi system. Avoid cheap wireless extenders that claim Orbi compatibility—they often cause interference or double-NAT issues. If you want, I can pull up a few specific models that pair nicely with your RBR750/RBS750 setup.

Matches well? The actual RBS750 satellite.

Can be used but won't integrate? Pretty much any of the extenders or even a router. 

If you've got hardwired access, you can use an extender or a router and run them in access point mode. They won't integrate with your network as part of the mesh. If you're wanting that, get the actual satellite. Otherwise, it merely comes down to what you're budget is and what you want it to do. You didn't give any details of what your budget is or what you're using it for, the coverage area, etc. 

I'd probably either look at a router or an EAX extender. Amazon has a pretty good selection of renewed devices which can keep costs down for your purpose. Heck you could get a renewed RBK752 system for around that $200. Use the satellite and keep the router as a backup since you'd have so much into an orbi system