Can get an 'aoostar GODY' on AliExpress for US$1000. Basically the same GPU, 16GB RAM, 512GB SSD. The steam machine has less cores and less ethernet. Though it also has a way bigger heatsink, LEDs and extra Bluetooth/valve gamepad antenna.
Comparing the deck to comparative brands, it is wayyy cheaper. I think valve are going to be aggressive on price, especially when the CPU/GPU are fairly old and meek.