Don't plan on being able to get good rubber floor mats from the U.S. Toyota dealers. After the unintended acceleration scandal they recalled all of their floor mats and started offering crappy replacements that don't have thick enough lips on the edges to catch dirt, water, snow, etc.
Example:
I would recommend WeatherTech. They have an excellent product and they're made in the good ol' U.S.-of-A. Open any car magazine and there's a several-page spread on their products.
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Current: 2005 Porsche 911 Carrera S 6MT
Previous: 2 BRZ's, 997 C2S, C5 RS6, C4 S6, B8 S4, GDB STi, S30 240Z, FC3S RX-7 TII, AW11/SW20 MR2, E30 318is/325i, etc.