Building on the earlier suggestion, yeah Amazon is usually fine, but you gotta be super careful with who the actual seller is. Make sure it specifically says Sold by Amazon.com or the official XFX store... if it's some random third-party shop, you might run into issues with the warranty later on. I'd also suggest checking Newegg or B&H since they're definitely authorized too. If you're looking at the actual cards, the XFX Speedster QICK 319 Radeon RX 7800 XT Core Edition is usually the best bang for your buck right now. You might want to consider the XFX Speedster MERC 319 Radeon RX 7800 XT Black Edition if you want that extra bit of cooling and slightly higher factory clocks, but tbh the QICK handles the thermals just fine for most setups since it still uses that chunky 3-fan layout. Just keep an eye on the prices tho, they tend to fluctuate a lot between those two models. Always better to double check the return policy too just in case of coil whine or anything weird.

https://www.xfxforce.com/where-to-buy-2