I buy all my covers off of etsy. I love the seller eKovers she does an amazing job (they aren't sleep cases though) but I've never cared for sleep cases.
https://www.etsy.com/ca/shop/eKovers
I've had my Glo case from her for 4 years. I'm a heavy ready and drop my kobo all the time. No issues, and it's protected my kobo well and survived many spills and cleanings. Just an alternative to the boring "commercial" ones out there if you are looking for something with a little style
