Can anyone help with finding decent stock cage systems for both reps and small animals. Preferably teired as we only have a small room for live stock.

do you mean like small vivs or small plastic tub like things?
some shops house the smaller reps in exo terra small terrainiums
IF its small vivs then contact mark viv builder on here, or if its the small pastic tubs that you put hatchlings in then you should be abel to get those from somewhere like pregerines