Our normal print book recommendations are KDP and Lulu, and yes, they have a lot of sizes for print books.
What we do is define a handful of ebook sizes. Then, for each ebook size, we define a number of compatible print book sizes. We just change the margins of the print books to be appropriate, so that the content area of the ebook is respected.
This way you don't need to QA your print book again, and ensure that everything is laid out nicely.
So, if you go to Export > Print-Ready PDF, and scroll about halfway down the page to the Choose Print Book Page Size section, you will see a number of print book sizes which correspond to your ebook size.
If your ebook size is Technical, then you will see sizes which are like this:
Your ebook currently has the following page size: Technical
This ebook page size has the following options for print book page sizes:
Print Book Size Size (Imperial) Size (Metric)
7 x 10 inches 7.0" x 10.0" 17.8cm x 25.4cm
7.44 x 9.69 inches 7.44" x 9.69" 18.9cm x 24.6cm
7.5 x 9.25 inches 7.5" x 9.25" 19.1cm x 23.5cm
7.44 x 9.68 inches 7.44" x 9.68" 18.9cm x 24.6cm
Crown Quarto 7.44" x 9.68" 18.9cm x 24.6cm
Technical 7.0" x 9.1" 17.8cm x 23.1cm
So, in that case, all you will need to do is choose Technical and you're done.
If your ebook size is Digest, then you will see smaller sizes like this:
Your ebook currently has the following page size: Digest
This ebook page size has the following options for print book page sizes:
Print Book Size Size (Imperial) Size (Metric)
Digest 5.5" x 8.0" 14.0cm x 20.3cm
Digest, 5.25x8 5.25" x 8.0" 13.3cm x 20.3cm
Digest, 5.5x8.5 5.5" x 8.5" 14.0cm x 21.6cm
5 x 8 inches 5.0" x 8.0" 12.7cm x 20.3cm
5.06 x 7.81 inches 5.06" x 7.81" 12.9cm x 19.8cm
5.25 x 8 inches 5.25" x 8.0" 13.3cm x 20.3cm
5.83 x 8.26 inches 5.83" x 8.26" 14.8cm x 21.0cm
So, in that case, you would need to click the Edit Formatting link on that page:
If you want a different print book page size, your ebook page size can be edited by changing the theme here:
Edit Formatting
We want to help all our authors make print books as easily as possible, so we hope this feature helps with this!