The closest we have to that is our Starter plan. If you factor in the two-week trial, you get 6 weeks to find market validation for your idea at a cost of only $14. It's a pretty reasonable expense.
That's more than generous for someone who's launching a store as a full-time job. My use case is more "we produce some hobby stuff and would like to start selling a few products online as a side-side-project and see if it can grow". My market validation will take months or years, not weeks. This isn't a startup... :) I can see where that market isn't really attractive though.