Amazon also has Munchkin Backseat Organizer for $7.14 -> Now $7.12 -> Now $7.09. Shipping is free with Prime or on $49 or more.
Note, you can still order from Amazon, but it will be in stock on 4/21.
Editor's Notes & Price Research
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If you're not a student, there's also a free 1-Month Amazon Prime trial available.