it's not unusual for a corn snake to weigh 900 grams, I've seen some larger. However they were in the 5 to 6 foot long range. At 4 foot 4, 900 grams seems a bit overweight. (My snake is currently about 4 feet 2, and he weighs about 440 grams.) I feed him a 30 gram mouse every 14 days.
I would suggest, you feed something in the 30 to 40 gram range (Mice or Rats). This would be a large or Jumbo Mouse, or a Very young rat, perhaps a Pup or weanling. (Look around online at various mouse and rat distributors, you can get an idea.)
It's unlikely you'll be able to go to a local pet store and find exactly what you want, and they mostly carry only a certain number of items and sizes, but you could always talk with them and see if they'd be willing to stock what you need.
The 30 to 40 gram Suggestion I am giving you may be smaller that what the snake has been eating, but should be appropriate from it's 4 foot 4 length, and it probably needs to lose some weight anyway.
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