https://www.ebay.com/sch/i.html?_nkw=Addon+Cisco+Cwdm+Sfp+1510+Compatible+Sfp+Transceiver+Sfp+Mini+Gbic+Transceiver+Module+Gigabit+Ethernet&_sacat=0&_dmd=2

Addon Cisco Cwdm-Sfp-1510 Compatible Sfp Transceiver - Sfp (Mini-Gbic) Transceiver Module - Gigabit Ethernet

$301.00
$211.00

SFP (mini-GBIC) transceiver module - Gigabit Ethernet - 1000Base-CWDM - 1510 nm - for Cisco 3825 3845; Catalyst 2948 2950 2970 3560 3750; Supervisor Engine 720 II-Plus-TS