Your search for "XENPAK-10GB-SR" revealed the following:
NEW Cisco XENPAK-10GB-SR 10GBASE-SR MM Short Haul Transceiver Module
SKU: NSN-9405
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 191.99
• Only 2 remaining
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Cisco XENPAK-10GB-SR 10GB BASE-SR MMF Short Haul XENPAK Transceiver
SKU: NSH-2078
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• Only 1 remaining
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Brocade 10G-XNPK-SR 10GB BASE-SR 850nm MMF SC XENPAK Transceiver
SKU: NSH-3410
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 44.99
• Only 2 remaining
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Cisco XENPAK-10GB-ER+ 10GB BASE-ER 1550nm Extended Reach SMF XENPAK Transceiver
SKU: NSH-5396
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 112.99
• 29 in stock
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NEW Brocade 10G-XNPK-SR 10GB BASE-SR 850nm MMF SC XENPAK Transceiver
SKU: NSN-9485
Condition: New
Shipping: Overnight Options
Warranty: 365 days