Haven't tried this brand before but I wanted a pack of briefs of one colour (more difficult than it sounds!) for school to save time on children decision making. Worked out cheaper than Kmart undies.
Hanes Boys Underwear Cotton Brief 5 Pack $4.40-$6.23 (multiple pack colour and size options)
Hanes Girls Underwear Cotton Brief 5 Pack $3.49-$7.00 (multiple pack colour and size options)
Girls blue option size 3-4 is cheapest at $3.49
Edit: Some girls options sizes 2-6 still available otherwise all other stock unavailable.