The cheapest 1 gbps seedbox you can avail at dedi seedboxes
The small plan is for $15 , 1gbps unlimited torrents and unlimited traffic.
The medium Plan is for 20$ , 1 Gbps Traffic, Unlimited torrent and Unlimited Traffic
The medium Plan is for 25$ , 1 Gbps Traffic, Unlimited torrent and Unlimited Traffic
I have used this seedbox for over a month, the seedbox speed is amazing they actually deliver much more than they promise. If speed is your main concern this is the best and cheapest option for very fast seedbox.
To go to their website : http://dediseedbox.com/