https://www.ebay.com/sch/i.html?_nkw=Addon+Dlink+Dem+210+Compatible+Sfp+Transceiver+Sfp+Mini+Gbic+Transceiver+Module+Fast+Ethernet&_sacat=0&_dmd=2

Addon Dlink Dem-210 Compatible Sfp Transceiver - Sfp (Mini-Gbic) Transceiver Module - Fast Ethernet

Regular price
$221.00
Sale price
$151.00

SFP (mini-GBIC) transceiver module (equivalent to: D-Link DEM-210) - Fast Ethernet - 100Base-FX - LC single-mode - up to 9.3 miles - 1310 nm - for D-Link DES 1210; xStack DES-3552