Your search for "mtef" revealed the following:
StarTech.com SFP10GSRST 10GB BASE-SR MMF 850nm 300m LC SFP+ Transceiver
SKU: NSB-1139
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW F5 OPT-0016-00 10GB BASE-SR 850nm MMF 300m LC DOM SFP+ Transceiver
SKU: NSN-1992
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco WS-C3650-12X48UR-E (36x 1GB 12x MultiGB) UPoE RJ45 8x SFP+ Switch
SKU: NSN-1097
Condition: New
Shipping: Overnight Options
Warranty: 365 days