Or, if you felt like a project and had an old computer laying around, the fun way would be load balancing between the two internet connections so each of the computers share both internet connections. If you download torrents it would double you're speed too (won't do anything for the speed of direct downloads).
using pfsense (or similar) on an old pc, using a vlan to keep it to one cable running between the two locations, and a bunch of fun writing all the rules (all https goes out this internet connection only, etc.) here is how it would look:
How the 4 computers would see it:
I really doubt you'll be doing this, I mostly just wanted an excuse to break out paintbrush
Did you get it running as lyleb suggested?