I"m doing a demo at a local store for mostly folks who have never played at all.  I have the starter box for the new(ish) Heroes of the borderlands adventuires.  I'm looking for a legitimate source to a printable file for the character sheets formatted like the ones included in the box.  There are only 4 characters there and I'll have 5 so I need more sheets...

Thanks in advance for any help, or redirection if this the wrong thread for this question

There's no source for those styles of sheets. You'd have to make your own

I have a link to Facebook which links to a Patreon and they claim they are Free and print ready of multiple classes. ( https://www.facebook.com/groups/392678574938393/posts/1978404583032443/ )
Unfortunately, i can't find any completely blank ones, but you can likely make a copy of the sheets and erase the relevant info to make a blank fillable template.
Sorry i couldn't give you exactly what you needed.