By ANNE D'INNOCENZIO, AP Retail Writer NEW YORK (AP) — Shoppers are spending freely heading into the holidays, but heavy investments and incentives like free shipping by retailers are giving Wall Street pause. Target Inc., Kohl's Corp., Best Buy Co. and TJX Cos. all reported strong sales at stores opened at least a year. That's a key measure of health for a retailer. Online sales also surged. Target