Steam-prices is a project mainly written in Ruby, it's free.
v0.2.2
v0.2.1
v0.2.0
v0.1.9
v0.1.8
v0.1.7
v0.1.6
v0.1.5
v0.1.4
v0.1.3
v0.1.2
v0.1.1