The Zyxel C3000Z modem is still used, particularly with CenturyLink (now Lumen) for DSL connections, as it's a reliable combo modem/router, though it's an older WiFi 5 (802.11ac) model, so newer tech exists, but it's considered a decent gateway for DSL and sometimes even fiber, offering good range but potentially slow interface.
Key Points:
Still Supported by ISPs: CenturyLink still lists it as a recommended modem for DSL service, though their newer Actiontec C3000A is being phased out.
Good for DSL: It's a solid choice for DSL internet, providing both modem and router functions.
Outdated but Capable: It supports older Wi-Fi 5 (802.11ac) standards, not the latest Wi-Fi 6/7, it offers decent range and detailed stats.
It's not the newest device, but if you have DSL and your ISP supports it (like CenturyLink), the C3000Z is a functional and still-used modem/router combo. Complete with DSL cables, power AC adapter
I also have a q1000z modem for $25, which can still be used:
The Zyxel Q1000Z modem supports maximum download speeds of up to 40 Mbps over a VDSL connection. The maximum speed supported depends on the type of DSL service you have.
Maximum Speeds by Internet Service Type
VDSL: Up to 40 Mbps download speed.
ADSL2+: Up to 20 Mbps download speed.
ADSL: Up to 7 Mbps download speed.
The modem also features 802.11n wireless technology with data rates of up to 300 Mbps, which refers to the speed of the local Wi-Fi network connection (LAN), not the internet download speed itself. The wired LAN ports on the device are 10/100 Mbps, not Gigabit Ethernet.