Drop is one of the rare shops that don’t run group buys, but have in stock items instead. Mostly. No need for fomo unless stated otherwise on the product page.
Also, they have at least one buy-one-get-one-free sale per year. Because of that, you have a good chance of getting one second hand for less than a new one.
Regarding kitting you have to watch out for modifiers in the correct size for the correct row, but most keyboards are fairly standard with the exception being the bottom row. Check Shift, Ctrl, Alt, Space and Fn/Win for correct size.