Material Shader vs Full-screen shader

Hello all,

I am working on a mobile 2D game and was looking for a way to create a simple glow effect for my sprites. I quickly realized what I'd really like is to create a full-screen bloom shader. It appears in Unity that full-screen shaders are only possible with a Pro license.

An alternative would be to apply a glow shader on a per material basis.

I believe I could achieve the same look with a material based shader but I am concerned about performance. Does Unity batch together draws for the same material/shader or would I be taking a big performance hit?

Thanks,

Jacob