Actually, I found it to be CHEAPER to travel back on another airline from CUZ or IQT.

I costed up TA out and back to CUZ and it came out at around £217 full fare return.

Substituting a return flight with Lan Peru or I think the other airline code is for Aerocontinente, takes the overall cost to around £172.

This was on published fare tariffs however, so if you have based your TA flights on discounted tariffs then they may well be cheaper.

Regards
Samuel