1) I boogled the address they said they had on their contact us page, and it is a residential property somewhere in Connecticut, and it also shares an address with a "company" that has a very similar webpage design but selling completely different things.
2) Lots of grammar and spelling errors, these are from their about us page, there are more in other places
"No Hassel Refund Policy"
"As for other inquiries email, we will reply in 12 hours."
"Your satisfaction is what we are strived for. So we offer 15-day satisfaction guaranteed return policy. More details, please refer to Return Policy."
"Credit card as one of the most convenient payment methods will also bring more safety for the purchase."
"As a responsible company, we will do everything we can to ensure the safety of purchase, for which we use a variety of security technologies to protect the information security, non-disclosure."
I'm no English teacher, but boy is it triggering my inner OCD demon
3) Their social media links don't actually link to social media pages
4) Boogling "ericplace.space" yields some clothing results that when clicked on show a 404 page. Seems quite off for a Kindle "seller" to sell clothing
EDIT: Another thing, the register an account thing says input your email and we'll give you a password there, mildly shady imo
EDIT 2: Their privacy policy page has a bunch of placeholder things, like "The Site is not intended for individuals under the age of [[INSERT AGE]] ."