If it's not embargoed by the publisher (doesn't happen often; mostly for new releases by Very Famous People or latest hardbacks from well known authors) most books can arrive and be on sale up to two weeks before their official publication date! (I love having ✨bookseller inside knowledge✨)

okay this is exactly the kind of thing my publishers do not tell me haha, thank you. I had someone very nice a week or so ago like "oh no did I get it early.... will the indie bookshop get in trouble" and it's great to know I can start telling those people it's fine