The Swap Magic web site lists sites you can get the discs from
I own Swap Magic myself (I have no intention of selling it though
) and have not used it in years due to using freebootmc + ESR for my games, that does not require a flip top or disc swapping, patched DVD games work directly no boot disc needed and the exploit runs directly from the PS2 memcard.
Sony may repair it if the sony validation sticker has not been broken, though no idea what that would cost
buy a broken for spares xbox from ebay or amazon or the like, not sure if you can still buy replacement cases
I wouldn't know for the rest of the Q's myself