Not sure if this is available in all stores (should be) But Tesco Sandhurst has their Value brand 'Angel Delight' desert mixes for just 3 pence!!! Strawberry seems to be the one they have in stock in bulk,but I was able to get Banana & Chocolate.Not really any different from the more expensive 'Angel Delight' mixes & a fraction of the cost!!!
My kids can't tell the difference so I stocked up as they have a long shelf life!!!
Hope this is helpful-Be gentle-it's my first post!!!!