First, a slow retail year saw shoppers defect to cheaper competitors such as Wal-Mart, and then Isaac Mizrahi departed for Liz Claiborne. Now the discount retailer known for trendy design is going green. Starting in October, new Target stores are expected to carry more natural and organic beauty items, as well as a larger selection of consumer electronics and groceries. The company said in March that it's in talks with an unnamed investment partner to sell half its credit card receivables for about $4 billion.