Many printers have guillotines which will cut off the spines as will any book-binder.
If you have loads to do you could think about buying one. Mine cost about £200 ($320) from ebay a few years ago and has done about 1200 books.
Using a manual guillotine is a bit of an art, I've found.
I've fixed the support that holds the book edge in place and move the book around with some shims (thin pieces of plastic). The width of a 'standard' paperback varies by over 1/4 of an inch - even between books in the same series published at the same time!
Also, I've stuck some high friction material (intended to stop chopping boards moving) on the base which reduces the amount the book moves into the blade as it is chopped.
These issues may be unique to me or my guillotine, but if not I hope this is helpful.
Iain
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