Im also curious about this, I couldnt get on that that drop in MD with the grey/cyan. They are priced a bit high but considering its from a vendor, i assume its normal.
They also have some pbt keycaps with cherry profile with different dyesub colors on sale. which are also tempting

Hope to hear reviews on their keycaps especially if they are as thick as the ones varmilo makes which are my baseline for pbt thickness.