I currently own everything for SotM and essentially leave it with a club at college I frequent to be used there. But with graduation lurking in the "near" future my copy would be going home with me. The people who run the club were looking to buy a new copy and were wondering if a complete set would ever be sold. Not the "Everything in the Multiverse" collection because they don't want to tie up club funds in a Kickstarter, but some sort of bundle on the store they could just buy all at once and it'd be everything.
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Outside of this kickstarter you'd have to wait for all the expansions to be in stock and order them that way.
Honestly the Kickstarter would be the best course.