Hostmonster is/was part of
Bluehost, and EIG destroyed them years ago. It was imploding along with
Hostgator in 2013, 2014, and 2015. They're now operated by the same cPanel division of EIG, and thus
Bluehost, Hostmonster, and
Hostgator are identical in every way.
Siteground changed their price about a week ago, to about $10 monthly. It's a test. They may reduce it again, leave it, or settle in the middle. But all said, they are outstanding, even at the higher $10. And honestly, $4 doesn't do them or you any good, as they don't want to hurt their business by cutting corners. They'd not adjusted prices in at least 5 years.
If not using a CMS like WordPress, standard shared hosting should work well.
If not
Namecheap or
Siteground, then consider
Veerotech. They have free SpamExperts for one domain. They have a 30% sale right now, no coupon needed. and the 10-domain plan would be $12. If you content them about just 6 domains, the may cut off a few more dollars, It never hurts to ask!