I'd buy a pre owned card from eBay.
Go with RTX 2070 Super which should be around your price point. If not, then RTX 2070 (not super).
Make sure returns are accepted, and seller has high rating (99%).
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I'd buy a pre owned card from eBay.
Go with RTX 2070 Super which should be around your price point. If not, then RTX 2070 (not super).
Make sure returns are accepted, and seller has high rating (99%).
Needs to run well on Linux
AMD.
If you don't mind used, RX 460/560 will do what you need and don't require any power from a PSU. There are loads of them on Ebay for well under 100. Now that I'm looking, the RX 570s are well below 100 now as well. Good time to get an ultra budget Linux gaming machine built. But those require an 8 pin PSU lead, I believe.