In reply to emerson.lemm:
Most half's cost somewhere between £100-£200 each, depending on length, diameter and if they have any additional protective treatments on them.
You can however find some really good pair deals online, various online stores have them from time to time, it's worth keeping an eye out for them. 60m half pair deals normally cost between £250 and £300.
£130 for 2 used 60m Mammut Phoenix is a little steep, given they are 8mm, you might only get another season from them before you need to replace them, although I have heard they are pretty robust for 8mm. You could have probably spent not a huge amount more and got new ropes with a full usage history and in the long run, a longer life span from them.