Your search for "sfp-1g-zx" revealed the following:
NEW Cisco GLC-ZX-SM 1GB BASE-ZX 1550nm 80km LC SMF SFP Transceiver
SKU: NSN-9336
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 587.99
• 13 in stock
Call if you need more
Dell SFP-1G-ZX 1GB BASE-ZX Extended-Reach 1310nm 80km SMF LC SFP Transceiver
SKU: NSB-5920
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 10053 1GB BASE-ZX 1550nm SMF SFP Transceiver
SKU: NSN-5669
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco GLC-ZX-SM-RGD 1GB BASE-ZX Extended Rugged SFP Transceiver
SKU: NSN-1390
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme 10053 1GB BASE-ZX 1550nm SMF LC SFP Transceiver
SKU: NSH-3286
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco GLC-ZX-SM-RGD 1GB BASE-ZX 1550nm 80km LC SMF SFP Transceiver
SKU: NSH-2114
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days