Cramer: Take Advantage of Opportunities to Buy Lululemon, Costco

Jim Cramer reveals his strategies on how to buy Lululemon and Costco -- two retailers he thinks investors should be adding to their portfolios. Ahead of their earnings reports next week, Cramer says he expects bad results from Lululemon. While they should be better, overall he says he doesn't believe management is executing well. He explains at what levels big shareholders will view the stock as undervalued and represent a good buying opportunity. As for Costco, a retailer that's been thriving, Cramer says momentum can be sustained. He calls it 'the great American retailer' currently and says it's worth buying on every single dip. Despite the fact that shares have been on a tear, Cramer says the stock does pull back, and investors should take advantage of that.