I was curious to figure out what the beefiest single board computer under $30 is (AKA C$40). The first real standout is the Radxa Cubie A7Z. The model with 1 GB DDR4 meets that. Features an Allwinner A733 SOC: 8 CPU cores, PCIe 3.0, WiFi6+BT5.4, RISC-V coprocessor. π€―
Also available with 2/4/8 GB.