Confirm the application
A fuse holder for a camper's 12V fridge circuit and one for a marine battery bank are different products: different amperage, different sealing, different materials. Fix the application before you compare prices.
Review the sample properly
On the sample, check the contact tension, the housing material marking (PC/PBT or PA6, not recycled filler), the terminal plating, and how the unit is labeled and packed. Approve bulk only after these match the spec sheet.
Get the documents before shipment
Ask which documents exist for the specific item, CE or EMC test reports and material certificates, and get copies before the goods ship rather than after.