Keep in mind, not all plated bullets are the same. And some "plated" ones are really copper-washed. Personally I like X-treme bullets, which used to be called West-Coast bullets.
We organize a group buy at the club, and get a pretty good discount when we order over 25,000 (which isn't as many as it sounds as the last three orders we 52K 45K and 55K).
Besides the cost, I think the less handling of lead the better.