Draft. And the occassional 6 year FA or R5 pick(that gets sent down the following season). For the most part, you're only getting 2-3 future BL players in the draft. So I make sure I'm not wasting a pick. I'm not a fan of IFA because I think they're a poor use of resource(too expensive). But, if you want legit prospects other than the draft, you have to trade for them. If you have an aging, redundant player and another team suffers an injury, that's a good place to start. Also check the teams that are in the WC hunt. Your guy might be the one that puts them over the top. A lot of times you're just chasing your tail but, if it was easy, everyone would make the playoffs.