Your search for "OSFP-400G-SR8" revealed the following:

NEW Arista OSFP-400G-2FR4 400GBASE-2FR4 up to 2km over 2x pair duplex SMF OSFP

SKU: NSN-6700
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista OSFP-400G-DR4 400GB BASE-DR4 500m Over Parallel SMF OSFP Transceiver

SKU: NSB-5209
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista QDD-400G-SR8 400GB BASE-SR8 100m Parallel OM4 MMF QSFP-DD Transceiver

SKU: NSB-5242
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista QDD-400G-XDR4 400GBASE-XDR4 2km over parallel SMF QSFP-DD Transceiver

SKU: NSN-6733
Condition: New
Shipping: Overnight Options
Warranty: 365 days