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.

Interested in more info on PriceSmart? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. The Motley Fool owns shares of Wal-Mart Stores and Costco Wholesale. Motley Fool newsletter services have recommended buying shares of Costco Wholesale and Wal-Mart Stores, as well as creating a diagonal call position in Wal-Mart Stores. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.