My supplier is currently out of stock of the Modern frame style (which is also used on most of my Shelf frame styles).
At the moment there is no information on when this might be back in stock. My own stock is 2 x Giant Size and 1 x Large size so these are all that I have listed on the website at the moment.
The Square style is a good alternative, but if you want the Modern style especially then do let me know and I can inform you once it is back on line.
Thanks, and stay safe!