Where a uniform item is only available from a single outlet, prices are likely to be higher than they would be if parents or carers were able to buy the item from different sources.
Pan fo eitem gwisg ysgol ond ar gael o un man, mae’r prisiau yn debygol o fod yn uwch nag a fyddent pe bai rhieni neu ofalwyr yn gallu prynu’r eitem o wahanol ffynonellau.