Your search for "a900-ima8z" revealed the following:
Cisco A900-IMA8Z ASR 900 Series 8x 10GB SFP+ Router Interface Module
SKU: NSH-6130
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 646.99
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NEW Cisco A900-IMA8Z ASR 900 Series 8x 10GB SFP+ Router Interface Module
SKU: NSN-2483
Condition: New
Shipping: Overnight Options
Warranty: 365 days