Your search for "407-bbou" revealed the following:
Dell 407-BBOU 10GB BASE-SR 850nm MMF RK0CX SFP+ Transceiver
SKU: NSB-0604
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 69.99
• 54 in stock
Call if you need more
NEW Dell 407-BBOU 10GB BASE-SR 850nm MMF RK0CX SFP+ Transceiver
SKU: NSN-0883
Condition: New
Shipping: Overnight Options
Warranty: 365 days