Amazon.com: ASUS Socket AM3/AMD 760G/A&V&GbE/Micro ATX Motherboard s M4A78LT-M : Electronics
Motherboard Am3 Mini Pc Support Adaptor Mini Atx Top45 T7100 - Buy Motherboard Am3 Mini Pc,4 Ethernet Ports Motherboard,Net2550 Fanless Motherboard Product on Alibaba.com
HP 537376-001 - AM3 Micro ATX Motherboard - CPU Medics
am3 motherboard | Newegg.com
I found it. An mitx sized AM3+ motherboard. : r/Amd