Maternity clothes rant

Why is it that maternity clothes are NEVER on sale!?!?!?! My last baby was a summer baby and now I'm having a winter one. As much as I would love to go spend hundreds of dollars on new clothes, unfortunately it's not possible for me. It's so annoying that now I have to either squeeze into sweaters and hoodies that I already have or go spend $30-50 each for one's that fit!!!! I'm cold and emotional right now and just want a comfy freaking sweater!!!!!