Here are three of the best ones to consider right now, if you have a few thousand bucks you're ready to put to work in the market. Consumer Intelligence Research Partners reports there are now more than 200 million Amazon Prime members in the U.S. alone, accounting for a majority of what's estimated to be over 300 million regular worldwide customers. Occidental PetroleumLastly, add oil and gas giant Occidental Petroleum (OXY +0.71%) to your list of Warren Buffett stocks to buy if you have $3,000 you're ready to leave in the market for a while. That is: While alternative energy sources like solar, wind, and even nuclear may be the future, that future is way, way down the road. More to the point for interested investors, this stock's three-year soft patch could be winding down soon enough.