Your search for "mlx-10gx4" revealed the following:
NEW Extreme Brocade BR-MLX-10GX4-X-ML MLX Series 4x 10GB XFP Router Module
SKU: NSN-1976
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 369.99
• Only 2 remaining
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Extreme Brocade BR-MLX-10GX4-X-ML MLX Series 4x 10GB XFP Router Module
SKU: NSH-5782
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 133.99
• Only 2 remaining
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Extreme Brocade BR-MLX-10GX4-IPSEC-M 4x 10GB SFP+ 4x 1GB SFP Switch Module
SKU: NSH-6984
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 606.99
• Only 1 remaining
Call if you need more
NEW Extreme Brocade BR-MLX-10GX4-IPSEC-M 4x 10GB SFP+ 4x 1GB SFP Switch Module
SKU: NSN-2594
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 619.99
• Only 1 remaining
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Extreme Brocade BR-MLX-10GX4-X MLX Series 4x 10GB XFP Router Module
SKU: NSH-7146
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme Brocade BR-MLX-10GX4-X MLX Series 4x 10GB XFP Router Module
SKU: NSN-2555
Condition: New
Shipping: Overnight Options
Warranty: 365 days