This is a little site I've had a for a while now. I've added a new page that compares the prices and memory bandwidth of machines with RAM shared between CPU and GPU. I've only listed machines based on DGX Spark, AMD Max+ 395 and Mac Mini and Studios, as they all have sufficient memory bandwidth and size to run LLMs.

There was a recent comparison at https://aimultiple.com/dgx-spark-alternatives discussed at https://news.ycombinator.com/item?id=48732679 . My site aims to give up to date prices.