yeah i found it really difficult to get hold of the grids cheaply, so in the end i used run panels ( the big tall ones for rabbits) chopped im half height wise, with a correx base, but my piggies never used all their space, they just clung to a corner (rescues with horrid pasts) so now we use 140cm x 60cm commercial cages, they may not be ideal, but my piggies are happiest in them