A.M.
From a teacher's perspective, yes, this is very common. I always started the first day by collecting everyone's supplies and putting them away. Believe it or not, this is the best way to make sure that supplies are not lost or wasted and that they will make it to the end of the year. If you want to buy some personal items, you can contact the teacher ahead of time and ask which items she doesn't collect. Or, like someone else posted, make it a big deal to pick out backpacks/lunchboxes/clothes.
Have fun!