If you were planning to buy parts new and build the computer yourself, I threw together a parts list for an all-AMD system that’s appropriate for Linux (I recommend Bazzite) and has a good price-to-performance ratio; $1200 to beat the pants off a Steam Deck and be very future-proof in terms of hardware features, platform support, and general performance.
If you’re thinking about buying used older-gen parts or a prebuilt system, compare gaming benchmarks of the GPU or CPU you’re looking at to the components in this build to see if it’s an upgrade or downgrade. This is probably the best price-to-performance prebuilt I’ve found in a few minutes on Amazon, couple hundred less than the parts list above, but it’s on the older AM4 platform (5000-series Ryzen), an older generation GPU (6600), and much less storage.
Lastly, obligatory mention of the last PC build guide you’ll ever need. Good luck!
They were trying to send this link and I’m going to strongly disagree with them - that system is a substantial downgrade from a Steam Deck. The GPU is a GT 1030; on top of being Nvidia, it’s 8 years and 4 generations old and was bottom-tier when it was new.
That said, the idea is sound. Buying an actual gaming desktop PC from a few generations ago can be a very budget-friendly option, but shipping an assembled PC is a nightmare for multiple reasons, and even more risky secondhand. If you’re going to buy a used prebuilt PC, find one locally and pick it up yourself, don’t have it shipped to you.