As title the finned sintered?

Are you sure you want sintered? I tried them and they where noisier than a noisy thing and didn’t last much longer than the resin ones.
I get my resin’s from Merlin, probably not the cheapest but they have them in stock and delivery is quite quick, a lot of places advertise cheaper but then you have to add postage and it works out the same.

Sintered are the best choice. I’ve never suffered from noise with them and they will outlast resin in the UK. Your LBS should be able to match online prices as Shimano are lowering their trousers slightly in prices.