I know TMC got lend you try all their pumps for $15 if I'm not wrong. Or you can go the breastfeeding support group and try.Check with your hospital, some hospital do rent out pump (at least u can try first?) Different brand, different design, if u big size.. some brand maybe the funnel is too small for u... and not suitable.. so ask ard.. gather more info first lor.. anyway in singapore quite easy to get one any time.