I honestly didn't test any other pages, but now that you said you did, i had to try it, and your right. Seams all the other pages are working. Odd.
I was able to add a joystick, and 4 port adapter to my "cart" as well as a subway USB item, and so on. Then i didn't go through with the order, as i don't need / want the items. Anyway. For anyone still wanting a ACA 1230/56 i do recommend that the extra hassle involved with filling out the form and getting a email sent to them is dealt with. I have no idea if they have any left, but that way the guess work is taken out of the equation. As i said, they were very friendly to email with.