If you have a low budget for Teacher's Day, then you can make a painting yourself and gift it to your teacher. Your teacher will also be impressed by your art.

On Teachers' Day, children can give greeting cards to their teachers in which they can thank and appreciate their teachers. Children can make greeting cards with their own hands 

You can also gift an indoor plant to your teacher on Teacher's Day. It will not only decorate your teacher's room but will also be remembered by him for a long time. 

You can gift a nice pen to your favorite teacher. This gift will be useful to them or something which they love the most which you know.