they are supposed to be different each week but now he has listed the same item or with minimal difference from previous weeks back into the limited shop twice this has to be intentional so they can try and milk as much money from skin speculators by calling it "other" whilst the avg player count dwindles lower each week now currently sitting below 800.
In my opinion they should seriously consider dropping the price of the game permanently instead of doing a sale every now and again hoping to get a couple new player who leave after a couple hours of gameplay and plus they should change the game to early access to combat most of the negative reviews and as it is in no way near completed.
garry has previously said he wouldnt do a sale yet until the game is in a better state as to not add to the already negative reviews / sentiment so the player count is just gonna stay sideways atleast for a while probably.
if you at all enjoy the cosmetics s&box has to offer and want to be a reddit mod here feel free to leave a comment