DISCLAIMER: I have no affiliation or involvement with this Groupbuy and I am posting it here only because I think it’s a great kit for a fair price.
There’s a Groupbuy in progress for a 60% with an integrated HHKB or Standard integrated plate. This, in my opinion, is one of the best CxB in a while.
It’s the TR60 kit, and it costed me $167 before shipping for the complete case with plate and a Blueetooth PCB. The PCB works with AAA batteries and the runners claim it will last for 6 months(!).
Here’s a link to the GB in Geekhack: