alt Hacker NewsAMD has their Strix/Gorgon Halo as a competitor to DGX Spark, which is at least in the ballpark in terms of bandwidth, and being x86 has some compatibility benefits.
If you wanted a GPU with 32GB of memory for AI tasks, the AMD AI Pro R9700 was (up until about a month ago) reasonably priced at ~$1300. It's not a RTX 5090 in terms of bandwidth and compute, but for the price and being actually purchasable it's a reasonable pick.
I like to think that if there are wins to be had, the market will price that in.
Those cards are cheap because they're not really that amazing.