Never once in 12 years of teaching did we NOT run out of kleenex well before the end of the year. We only asked for 2 boxes per child and once we hit cold and flu season those boxes disappeared fast. Mostly due to runny noses, but occasionally due to a child 'playing' with the tissues.
And at the first year in a new building, we used the district list of supplies which didn't match up with the list our group of first grade teachers wanted. That year we did have to modify what was brought to school. I didn't like changing it up on the parents, but having the right tools for the job made everything run more smoothly. I do know it is a hassle for parents.
I never used community supplies after working in a Kindergarten room and seeing the kids that never brought in supplies breaking all the supplies that someone else had been kind enough to bring. I agree it was frustrating. But every teacher has their own way of doing things.
As far as dry erase markers, we had 'slates' in each child's desk that I had bought out of my pocket. 4 dry erase markers were held by me and distributed new each quarter so that the kids could follow along with whatever was happening at the front board. I used supplies that were bought out of the school budget for the markers at the front, unless I wanted fun colors, which I bought myself.
On a cheap year I would save my receipts and usually spend nearly $2500 on things for special projects, storage containers (that were never paid for by the school at all), center games, colorful copy paper for notes home or art projects, all craft supplies except glue, good scissors when the student scissors were lost or broken, bookshelf for a library center, carpet, bulletin board decorations, and on and on.
If you come from a family of educators then you probably already know the expense that teachers go to in order to provide a quality learning experience for every child. Of course there are teachers out there that do less and some that do way above. Just like any other job, there are good and bad.
I know that I will be feeling the crunch when my 4 start Kindergarten and will probably be complaining about the school supply cost. I just know that the other side is not that much fun to do either.--Not that I didn't love teaching, just that it was a difficult balance to find what you needed and try to keep the cost at a minimum.