Manager Training Online Courses

I received an inquiry from someone I know, and I'm hoping people who read this blog can make suggestions.

I'm looking for vendors who supply off-the-shelf training for basic manager skills such as, time management and delegation. Thus far I've looked at Element K, SkillSoft, Vital Learning, Ninth House, and Achieve Global. What I like about these providers is the scope of what they offer -- many courses to choose from. Are there other providers you'd recommend I look at?

Those vendors are certainly at the top of my list and I'm not sure I have other suggestions. Any other providers that folks would recommend they look at? And why?