The Switch Lite is set to launch on Sept. 20th, 2019. Well, that's what Nintendo was planning, anyway. Some retailers don't feel like following the rules! There are multiple reports of retailers putting out Switch Lite units on shelves already, and some have been lucky enough to actually buy a unit. We know for sure that Walmart is, at the very least, putting units out on shelves. Whether you can convince an employee to sell you one before the 20th is up to your own persuasiveness!
Good luck getting one!