After releasing my own versions of haproxy with SPDY support and nginx with ngx_pagespeed and SPDY support, I decided it would make sense to actually host these in my own apt repository, so I did.
You can enable this by adding it to your apt config.
wget -qO - https://apt.kura.gg/apt.kura.gg.key | sudo apt-key add -
echo "deb https://apt.kura.gg/ `lsb_release -cs` main" | sudo tee /etc/apt/sources.list.d/apt.kura.gg.list
sudo apt-get update