Your search for "C9500-40X" revealed the following:
Cisco C9500-NM-8X Catalyst 9500 8x 10GB SFP+ Switch Module
SKU: NSH-7352
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 98.99
• Only 2 remaining
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NEW Cisco C9500-NM-8X Catalyst 9500 8x 10GB SFP+ Switch Module
SKU: NSN-1904
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 357.99
• Only 2 remaining
Call if you need more
NEW Cisco C9500-48X-A 40x 10GB SFP+ Switch w/ 1x C9500-NM-8X Module
SKU: NSN-3659
Condition: New
Shipping: Overnight Options
Warranty: 365 days