The latest configuration guide for the Neuropixels ecosystem can be found here: https://github.com/billkarsh/SpikeGLX/blob/master/Markdown/SystemRequirements_PXI.md#common-parts.
Here is a simplified shopping list:
Probe(s)
Headstage(s)
5m cable(s)
Recording system, either:
OneBox: OneBox (imec)
PXI: PXI Chassis (3rd party) + module(s) (imec, 3rd party)
Note that parts can break or wear out, so we recommend purchasing extras.
OneBox ships as an all-inclusive kit for ~ $3600 Euros. The PXl recording system requires components sourced from a variety of vendors. See below for a simplified PXl parts list: