Your search for "SFP-10G-BX40U-I" revealed the following:
NEW Cisco SFP-10G-BX40U-I Single-Strand 10GB BASE-BX40-U 1270nm BiDi SMF SFP+
SKU: NSN-4370
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,939.99
• 5 in stock
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Cisco SFP-10G-BX40U-I 10GB BASE-BX40-U 1270nm Bidirectional SMF SFP+ Transceiver
SKU: NSH-4625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,914.99
• Only 2 remaining
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NEW Cisco SFP-10G-BX40D-I 10GB BASE-BX40-D Single-Strand 1330nm BiDI SMF SFP+
SKU: NSN-4497
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 857.99
• 10 in stock
Call if you need more