Hi and welcome to the forum from Las Vegas in the US! Containers of just starters and alternators are a big ask outside of the very largest auto salvage companies or major core specialists (the former usually selling to the latter). I aggressively seek them out here and it still usually takes me a month to fill a just gaylord with either. The biggest yard here in the Valley does over a container of electric motors every week and only maybe one in three of those will have a box of alternators or starters tacked onto it. But you can always post pricing and see what happens!