Your search for "ex-um-4x4sfp" revealed the following:
NEW Juniper EX-UM-4X4SFP EX4300 Series 4x 10GB SFP+ Switch Module
SKU: NSN-3287
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 179.99
• 6 in stock
Call if you need more
Juniper EX-UM-4X4SFP EX4300 Series 4x 10GB SFP+ Switch Module
SKU: NSH-4921
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 77.99
• Only 2 remaining
Call if you need more
Juniper EX4300-48T-AFI 48x 1GB RJ45 4x 40GB QSFP+ Back-to-Front Air Switch
SKU: NSH-4917
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 282.99
• Only 2 remaining
Call if you need more
Juniper EX4300-48T 48x 1GB RJ45 4x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSH-4913
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 219.99
• Only 2 remaining
Call if you need more
NEW Juniper EX4300-48T 48x 1GB RJ45 4x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSN-2754
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 425.99
• Only 2 remaining
Call if you need more
Juniper EX4300-48P-AFI 48x 1GB PoE+ RJ45 4x 40GB QSFP+ B-F Airflow Switch
SKU: NSB-0640
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper EX4300-48T-DC 48x 1GB RJ-45 4x 40GB QSFP+ F-B Airflow (DC) Switch
SKU: NSH-4915
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days