https://www.ebay.com/sch/i.html?_nkw=Addon+Rad+Sfp+8+Compatible+Sfp+Transceiver+Sfp+Mini+Gbic+Transceiver+Module+Gigabit+Ethernet&_sacat=0&_dmd=2

Addon Rad Sfp-8 Compatible Sfp Transceiver - Sfp (Mini-Gbic) Transceiver Module - Gigabit Ethernet

$218.00
$150.00

SFP (mini-GBIC) transceiver module (equivalent to: RAD SFP-8) - Gigabit Ethernet - 1000Base-EX - LC single-mode - up to 24.9 miles - 1310 nm