Your search for "nim-" revealed the following:

Cisco NIM-4BRI-NT/TE 4000 ISR Series 4x BRI Network Interface Router Module

SKU: NSH-7063
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-4T ISR 4000 Series 4x Serial WAN Router Network Interface Module

SKU: NSN-6528
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-2MFT-T1/E1 ISR 4000 Series 2x T1/E1 Router Module

SKU: NSN-5122
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-4FXS ISR 4000 Series 4x FXS Router Module

SKU: NSN-1474
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco NIM-2FXSP ISR 4000 Series 2x FXS/DID Router Module

SKU: NSH-7064
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-2FXO ISR 4000 Series 2x FXO Universal Router Module

SKU: NSN-5853
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-2FXS/4FXO ISR 4000 Series 4x FXO 2x FXS Router Module

SKU: NSN-5154
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco NIM-2BRI-NT/TE 4000 ISR Series 2-Port BRI Network Router Interface Module

SKU: NSH-6859
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Cisco NIM-2T ISR 4000 Series 2x Serial Connector Router Interface Module

SKU: NSH-6770
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco NIM-2FXSP ISR 4000 Series 2x FXS/DID Router Module

SKU: NSN-5143
Condition: New
Shipping: Overnight Options
Warranty: 365 days