You can find it at this URL . If you haven't read previous issues and want to give it a try,
#1 is still available with a "Pay-what-you-want" promotion and there's also the bundle:
first 4 issues at $4 instead of $8!
The guys of PulpCultured.com reviewed Manifest #4 recently (here)! Go check their site
if you're into indy stuff!