You can also post a want on your local Freecycle. Also, some surrounding area freecycle groups will allow outside members if you are willing to drive to pick up. You may just find someone with a collection they will part with. I just found out my brother threw out a drawer full of corks and caps because he didn;t know about freecycle and the fiance didn't want them. Aauuugh.
I am a freezer paper fan too. I will look at the Pattern Ease to see what is more affordable and useful! Great tip. We are also military and move a lot, so the next move I will check the packing paper tip too.
For my infant I use snap tape instead of set metal snaps for the reason the set snaps come apart. I would remove the buttons and replace with one side of the snap tape. On the inner side of the buttonhole half of the shirt put the other side of the snap tape. This will basically 'close' the button holes so that you could just sew the buttons decoratively to the holes (they would be sewn to the snap tape that is underneath.) The snap tape will hold up to a child who 'rips' the shirt open, rather than undo each snap carefully. I know this because I do it when I get the baby undressed sometimes. Also, since the snap tape is sewn on, the only thing touching the child's skin will be thread.