Amazon has the Moto G8 play in gray for $145, and G8 plus for $205. Even less if you get it from their Amazon Warehouse.
Motorola Moto G8 Play XT2015-2 (32GB) 6.2" (19:9) HD+ 4G LTE GSM Factory Unlocked Smartphone (International Version) (Obsidian Grey)
In short: it works with GSM carriers, but not with CDMA (Verizon, Sprint). It doesn't have all T-Mobile bands.