Yoto store discount periods? MYO cards

So I wish to buy a ton of MYO cards from the yoto store. Unfortunately these don't fall under the current 5 for 4 promotion.

I'm wondering when they usually run promotions as I wanted to get these before my daughters birthday in April. I'm assuming the best you get is 10% off? Does the store run any other discounts like for students or something? I already have had an account for years so don't need referral codes, thank you