Your search for "407-BBGN" revealed the following:
NEW Dell 407-BBGN 40GB BASE-LR4 1310nm SMF LC WRJMF QSFP+ Transceiver
SKU: NSN-8406
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 155.99
• 11 in stock
Call if you need more
Dell 407-BBGN 40GB BASE-LR4 1310nm SMF LC WRJMF QSFP+ Transceiver
SKU: NSB-8374
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 144.99
• 11 in stock
Call if you need more