Why are T-slot bolts so expensive!!

Why are T-slot bolts so expensive!! m8 t slot nuts item T-Slot Nut 8 St M8, heavy-duty, bright zinc-plated is a universal fastening element with an M8 thread This heavy-duty bright zinc-plated steel T-Slot m8bet slot These T-slot nuts fit directly into the aluminium slot in any profile Fitted with a ball bearing which makes it easier to install the T-nut in vertical

m8bet slot nuts, 4 coupling nuts and 6 T-nuts in the 10mm size Here is the M8-x-1-25-Studs-Northwestern-40506-US-Made262293471112?ssPageName

m88 mansion slot M8 T Slot Nut, 10 Pieces Aluminium Sliding T-nut Threaded Track Nut Block for Woodworking Tool Fastener Split in 4 payments of SAR No interest No late Nut Type, T-Slot Tap Type, Through Thread Size, M8 Material, Steel Slot Width, Base Width, Base Height ,