I’ve just had two chains delivered, which I bought new from e-bay. They are KMC DLC 10 speed and would be expected to retail at £90 each. I usually buy Shimano HG 95s. They cost about £24 but the RRP is £35. The KMCs cost me £36 each. Much more than I’d usually pay for a chain but for the quality well worth it. I don’t even need to change a chain right now but no harm in holding some spares.