Drop is one of the rare shops that don't run group buys, but have in stock items instead. No need for fomo.
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. Also whatever you want above your cursors (PgUp/Down etc.) should be the correct row too unless you like to have a noticable heigjt difference (can be useful to not accidentally hit the wrong key).
Monacokeys from Munich sells XDA White on Black. Only in German though.
But you could hit 'em up on discord and ask if they are able to source you an US layout or point you to a shop that has those in stock.
https://discord.gg/6MH5KpjK