A bookplate is, basically, a sticker (like the one you see here) that I sign & personalize to you & mail it to you. You then peel the backing off & stick it inside the front of your book.
These are only available, for now, to US shipping addresses.
I apologize that there is a cost for this at all - but there are lots of expenses involved - from printing the bookplates themselves to the envelopes & postage & the fees I pay to accept your payment securely. I hope you understand.