I apologize for being late with this news; my usual sources failed to alert me to the comic's release. Unfortunately, based on my personal experience, it may be difficult to find Peanuts #5 at your local comic book store as it's been two weeks since the book was published. The issue can still be ordered directly from Boom! Studios, though. Looking ahead, if your comic book shop offers a subscription service (and most do), it may be wise to sign up for it, in order to reserve future issues of the Peanuts comic book.
Unlike the first time the Peanuts comic book took a break, this time Boom didn't restart with issue #1 again - thankfully, as it was already confusing enough to have two different issues labelled #1, #2, etc. So be on the lookout for issue #6 in two to three weeks... I'll try to announce it in a more timely fashion!