School projects do add up. I sympathize with the money you are spending.
Things to help: when back to school time comes around stock up on poster board, extra markers, colored pencils, colored paper, etc. I have a stock pile of stuff and normally don't have to go out and buy stuff during the year unless it is some 'odd' project.
The other side to look at is the teachers aren't doing this to see how much money families have to spend. I was at our elementary last week (my boys are high school but I had to do a party for a first grade class who won a contest for our golf team). Anyway I was talking to the teacher--- I had taken in bowls, napkins, pop, etc. I told her to keep the 'extra stuff'. She was SO THANKFUL! She said she budgets $10 per week out of her money for classroom items. She was down to 1 box of kleenex (oh the 2 boxes we ALL COMPLAIN ABOUT--- I even have to supply in middle and high school). If you think about it that is a minimum of $360 per school year 'extra' that she is paying. That is probably a minimal amount that teachers spend--- who is going to replace those boxes of kleenex they need for the rest of the year...sure teachers send notes home BUT we know most parents ignore saying I sent my boxes in at the start of the year or my child doesn't use them! I can honestly say my boys probably use 20 kleenex a year in school if that BUT anytime a note came home saying they were short I would get an extra box or two and send them in (at
Walmart the other day I saw holiday ones on clearance still---kids don't care if Xmas box of kleenex).
It is frustrating to us as parents to have to spend so much on supplies, it is frustrating to teachers to have to spend so much out of pocket BUT the schools are hurting and we all have to step up and pay. The teachers are using their money, gas, etc. too like we are to buy stuff for kids. They are in the same financial situations we are....high gas prices, high food prices, spouses out of jobs, etc. We all need to watch for the sales ---tell teachers if you see a good deal too. Or just pick up an extra. We all know basic back to school items. I also watch Staples free after rebate items and stock up then too.