Yes, believe it or not, PCI graphics cards are still a thing. Zotac has just announced one: a PCI version of the GeForce GT 520. The card is also available with a PCIe x1 interface, for folks who happen to be out of PCIe x16 slots yet still need an additional GPU. (I expect the PCI version will mostly please luddites and paupers with unusual priorities.)
Both the PCI and PCIe x1 variants feature a GT 520 graphics chip with 48 stream processors, 512MB of DDR3 memory, a 810MHz core clock speed, a 1333MHz memory speed, and a 64-bit memory interface. That works out to a whopping 10.7GB/s of memory bandwidth, in case you're wondering. DirectX 11 support is there, although it's mostly for show, and the cards have DVI, HDMI, and VGA output ports.
Newegg actually has quite a repertoire of 32-bit PCI graphics cards in stock, but most of the Nvidia models are relics from before the GeForce 8 days. Heck, there's still an old GeForce2 MX selling for $33.99. My first Athlon-powered gaming PC had an AGP GeForce2 MX, and that was over 10 years ago.