Those are the cheapest CFexpress 4.0 Type A and B memory cards:
Bilitu CFexpress 4.0 Type A memory cards
Pergear CFexpress 4.0 Type B memory cards
New: SmallRig 9 in 1 CFexpress (type A or B) photography docking station
Pergear announced new affordable CFexpress 4.0 Type B memory cards (512GB/1TB)