Casio M5610U with a metal mod I picked up for $99 and I love it! Pick up and go with never a care for durability or accuracy. World time across 5 presets, that you can swap back and forth with your home time at a press of buttons, solar powered, and radio receiving for auto updating of time and date.
What's your cheapest watch in your collection?
I ordered an F-91w lookalike but purple for $1.79 out of curiosity. I haven’t worn it yet but the other cheapest is an F-91w I got for $7 at a store near me that likes to put the wrong price on everything. I’ve bought 5 G-Shocks there for as little as $50.