I'll add my experience just for reference -
Software Hut is a reliable vendor but you have to email them to see what they have. They don't spend time updating the site as I'm sure the Amiga business is a side line for them.
My ROMS and OS 3.9 came in quickly and when the ROMs ended up being the same one, they quickly sent me out the correct rom to pair with one of them.
AmigaKit is definetely the more active organization but in the US shipping times are a lot quicker from Software Hut.
