Easy cash - Harvest Moon: A wonderful life
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All you have to do to become rich is buy one banana seed. plant it and it will grow next summer.
Take all the bananas and put them in the seed maker. don't sell those seeds but plant them instead. the next summer you should have alot of trees.
Take all the bananas and repeat this process until all your gardens are full of bananas. sell the rest of the banana seeds for alot of money each.
Next year you can put all the bananas in the seed maker and sell enough so in case your trees die you will have enough seeds to replace them.
Once you have enough, you can keep making seeds and selling them.
PS. trees have to have room around them so plant them every other spot and never cut them down unless they stop producing seeds.