I'm glad to announce a mirror for Zabbix repository for Ubuntu and Debian.
I manage 3 versions: 3.0, 3.2 and 3.4. For Ubuntu, you have trusty and xenial release. For Debian, you have jessie and stretch release.
Available architectures are i386 and amd64 for both distributions. armhf is only available for Debian stretch.
You can add this mirror in /etc/apt/sources.list.d/zabbix.list.
Example for 3.4 and Debian stretch:

deb https://zabbix-mirror.fredprod.com/zabbix/3.4/debian stretch main

Keyserver is: keyserver.ubuntu.com
Keyid: 1DFF230644068194

You can add gpg key:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1DFF230644068194

For other distribution, version and codename:

deb https://zabbix-mirror.fredprod.com/zabbix/*version*/*distribution* *codename* main

Just replace version with 3.0, 3.2 or 3.4, distribution with ubuntu or debian and codename with trusty, xenial, jessie or stretch.