The wood we use for bows that is so highly sought after, is called lemonwood or degame. But not all lemonwoods are the degame we bowyers appreciate so much. There are indeed some lemonwoods that are better known as satinwood. But that satinwood is NOT the wood used for bows. To add to the confusion, none of the several tree species producing a wood called lemonwood actually produces lemons (citrus fruits). The name lemonwood just refers to the color of the wood, and its similarity to the color of a lemon.
Don't use satinwoods in bows. Do use lemonwood, but make sure that you have the correct species of lemonwood. I'm not sure degame comes from Africa as well; I thought it was only from Cuba. Maybe the satinwood lemonwood, which comes in a few tree species to complicate things, comes from Africa? I know for a fact one true satinwood comes from India/Sri Lanka.
Degame is getting increasingly scarce and expensive. 180 USD for a stave sounds possibly, although excessive in my opinion. I would advice you to look for a cheaper alternative, which is more readily available (ipé, massaranduba, yew...).
Run a search for "Bradford [pear]" I'm sure this wood species has been discussed before.