New Loose Change Menu at Maccas has Frozen Coke and Frozen Fanta for $1.
It's $1 regardless of the drink size - the same price for S, M and L.
At least it's that way in MyMacca's app - I ordered Large Frozen Coke with Half Raspberry, and it was $1.
What's actually available for order is hit and miss depending on Maccas store. I've tried a few in Sydney, and Frozen Coke and Frozen Coke No Sugar were universally available. Frozen Fanta Raspberry is available on most locations, but not much luck with other Frozen Fanta Flavours. On a few places where Fanta Raspberry was not available, I could still add it half/half with Frozen Coke?
Soft Serve Cone with Flake is also $1 in the new menu. Though that's not much of a deal, as too often they don't have cones so they serve it in a plastic cup - and for teeth and tummy, cone is better than a cup.