It's not common but I wouldn't call it rare. Assuming you have a V-6 engine, a local wrecking yard here in Spokane WA has one. It's out of a 2001 Rodeo, has 55k, good oil pressure and they want $2300 for it. Of course, plus shipping then you'd have to install it or pay someone to install it. BTW, the website is
www.spaldings.com if you wanted to look it up.