Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of bulk retailer PriceSmart (Nasdaq: PSMT) are looking very smart today, jumping as high as 11.1% amid very heavy trading.

So what: This morning's third-quarter report crushed analyst estimates, driven almost exclusively by organic sales growth. Larger rival Target (NYSE: TGT) also jumped on a brilliant earnings report, and retailers are reporting great comps across the board; this is a great time to own retail shares.

Now what: PriceSmart also announced plans to expand its operations in Colombia, adding some expansion spice to the tasty organic sales dish. The former Costco (Nasdaq: COST) division is exporting the idea of warehouse clubs across Latin America and the Caribbean, in the style of BJ's Wholesale Club (Nasdaq: BJ) or Wal-Mart's (NYSE: WMT) Sam's Club, as the region becomes more affluent. The combination has struck a chord with customers and investors alike; the stock has gained 140% over the past year, and the growth story has only just begun.

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