You give them free time for a few hours everyday right? So they do get out of their cage – I think I read a post that you do so I would focus on saving for the spueters.
NIC grids are currently 14.99 at Target right now and the zip ties are 2.99 for a pack of 100. (Medium size).
Are there chores around the house you can do and have your mom pay you weekly? Do the dishes everynight, set the table, vacuum, etc?
What about selling candy at school? You can buy a large box then sell the candy for 1$ or $1.50 each and I think you could make some change to help out. I know when I was in highschool a lot of kids fund raised that way. Sitting in class being hungry and some kid with a huge bag of candy…everyone was buying it from them. And as long as you aren’t using the money to buy clothing and it’s going to help your rabbits. When my marching band went to China, kids were coming up with tons of different ideas on how to raise money for the trip – that was one of them.