Your search for "mlx-10gx20" revealed the following:
Extreme Brocade BR-MLX-10GX20-X2 MLX Series 20x 10GB (X2) SFP+ Router Module
SKU: NSH-6988
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 477.99
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Extreme Brocade BR-MLX-10GX20-M MLX Series 20x 10GB SFP+ Router Module
SKU: NSH-6989
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme Brocade BR-MLX-10GX20-X2 MLX Series 20x 10GB (X2) SFP+ Router Module
SKU: NSN-2350
Condition: New
Shipping: Overnight Options
Warranty: 365 days