Hello.
If still available, i will buy two (or at least once).
However, are you sure that a clockport expander can work with several serious expansions? For example, the subway and a catweasel probably check constantly for some signal on the clockport and conflicts may occur if both are connected?
Some years ago, i had a similar expansion called Quaddddroport but i never dared to use it with my catweasel and my subway as i was afraid to fry them.