Your search for "XENPAK-10GB-ER+" revealed the following:
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 Extreme 10112 10GB BASE-ER 1550nm Extended Reach SMF XENPAK Transceiver
SKU: NSN-5675
Condition: New
Shipping: Overnight Options
Warranty: 365 days