Try Hotspot Shield It's a combination of VPN and Proxy, quite literally it's OPEN VPN to establish your connection to a remote site in the US (Penn State I believe) then you use them as you're ISP hence proxy. We use it to bypass region lock. And the best part is, because its a VPN (think IPSEC) unless they block ppls ability to use VPNs it should get you around the proxy blockers... though I guess blacklisting the VPN endpoint would work just as well XD
FreeVPN
simple way is to use a ssh tunnel with socks capabilities, works like a charm. All you need is an shh shell which are plenty thanks the cornucopia of companies hosting free ones, just do a Google search for free shh shells host.