Please contact the rescue before you buy a cage, very often cages sold are below the welfare standard. Minimum living space for a pair is 120cmx60cm on one level, runs or extra levels are a bonus but do not count towards the minimum required. I sometimes have indoor cages available to adopters that meet the rehoming size. I can also point you in the right direction for the correct sized new cages and hutches for the best price online (not petshop prices!).
Guinea pigs in the rescue this week: