I use baby wipes to clean up juice stains on the carpet. They work best when the stain is still new, so have some wipes handy! The best wipes to use? Pampers :)
Don't buy - instead, ask friends, families, or even neighbors if you can borrow! You may also want to consider a Kids Clothing Swap between yourself and friends and others, to save money year round and not just on formal attire :)
I organize my child's drawers with all the latest sizes that she wears, current season only. Everything else that doesn't fit or is too big (or a diff. season) goes on the shelf in the closet (to get ready to donate or for when she outgrows the current ones).