Broken Gears

I need some help in deciding what is the best course of action. I have a 1994 Trail Boss 250 2 wheel drive. It needs a transmission or new gears in my transmission. Two teeth are broken off of the big gear and two teeth are broken off the small gear. Also found small pieces of a spacer. Pieces that are broken, look similar to the spacer that is partially visible above the broken small gear. Not sure what it is called. What would be the most economical to get the atv running again.
thanks

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