These aren't the best mesh units, but they might be the best bang for your buck. Unless you're a videographer with a lot of local network traffic, the limits of these devices are likely many times your internet speed, so even whole families of streamers won't be limited by them. If you have gigabit internet and regularly bang out the crap with steady, full-fledged traffic, you might be looking for devices with a dedicated wireless backhaul instead. Otherwise, for more capacity than you're probably looking for, they're very cheap and easy to set up.
Wi-Fi Mesh system Tenda MW3-3, white
18 Review
Tenda Nova Mesh WiFi System (MW3) - Complete Whole Home Coverage, 1-Pack
25 Review
Signal amplifier Tenda nova MW6-3 AC1200 Home Mesh WiFi system with 2 Gigabit ports. By
20 Review
AmpliFi HD WiFi System: Whole Home Coverage, HD Router, 2 Mesh Points
33 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review
UGREEN USB 3.0 Ethernet Adapter Hub with RJ45: Fast Gigabit Ethernet Converter, 3 Ports USB 3.0 Hub Compatible for MacBook, iMac, Surface Pro, Chromebook, Laptop, PC
11 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
12 Review