After a successful Kickstarter campaign, a new company was formed and orders will soon be taken. They are a young company, after all. At the time of writing, there is a test-product placeholder for 15 euros. So, we are guessing this will be the price.
Here in Europe, we are often charged for bags at grocery stores, etc, as an incentive to bring our own and reduce landfill waste. Notabag fits into this remit perfectly.