RTX Spark laptops are on pre-order from $2,599.99 and run up to about $7,000, well above the $1,799 and $2,899 leaks from June.
Entry models carry 24GB of memory, and the 128GB option sits at the top of each price range.
One retailer listing implies about $28 per extra gigabyte, so memory explains most of the price spread.
Bandwidth of 273 to 300GB/s caps a 60GB dense model near 5 tokens per second, so size the memory to the model you need.