Amazon has the Fat Daddio's 12-Cup Square Pan for $25.92. It is able to heat faster and cool quicker. It's also made with a non-reactive 18 gauge anodized aluminum. There's 16 in stock, so hurry and order!
Target has one that is the Calphalon Bar Pan for $17.09. It's both chip and break resistant.

Prepared Pantry has one for 19.99 that's made with welded link construction. It says it's on sale and that the consumer saves $8.00 with their pan.
Ebay has a couple of pans. The first one is a non-stick square pan that's selling for $19.00. It is unused, unopened, and undamaged.
The next is a Silicone Square Pan which is nice because this one's orange. As well as having a temperature that's safe up to 450F, it's also dishwasher, microwave, and freezer safe. It makes 12 cupcakes and is selling for $17.99.
*The gray pan is the Silicone one from Target*