BOOM! Studios acquired the license for Buffy the Vampire Slayer comics last year (see "‘Buffy the Vampire Slayer’ Finds New Publishing Home"), and now it will collect all the Buffy comics, including those from other publishers, as graphic novels.
BOOM! has several other Whedon-based collections in the works. Firefly: Legacy Edition has already launched, and the first two volumes are available now; each hefty paperback has an MSRP of $29.99 (see "BOOM! Studios Courts New Buyers with Legacy Edition"). And in October 2019, BOOM! will publish the first volume of Angel: The Legacy Edition, a 336-page paperback with an MSRP of $29.99 that starts off a chronological run of all the Angel stories (see "BOOM! Plans ‘Angel: Legacy Edition’").
Whedon took Buffy to comics in 2007, with a series published by Dark Horse Comics that continued the storyline of the television series. Both Dark Horse and IDW Publishing have published Angel comics.