@ColSpanker - FBA is great. If you know your demo, you can run Facebook ads to a landing page with a coupon code, which should provide some degree of conversion tracking since Amazon doesn't give you all of that data. Amazon ranks products within A9 based on reviews, price, engagement, and how people end up on your product. For example, if you're selling an iphone 5s case, customers that search iphone 5s case, click your product and order it, that'll impact your search placements within A9. You can also send mediocre links at an Amazon page and it'll rank in Google, eventually. If you do that, make sure to vary your anchor text a lot and *avoid* exact match anchors, i.e. "iphone 5s case" people get carried away with that and even on Amazon pages, you can overcook the anchors. This is assuming there's a larger market for the product you're selling.
If you want to game the system a bit more, you can hire people to buy your product and leave positive reviews so it'll show up as a verified purchase.
If you want to game the system a bit more, you can hire people to buy your product and leave positive reviews so it'll show up as a verified purchase.