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Cheapest way would be to hit a local carpet store and ask about remnants or scrap pieces. The sizes you'll need typically are tossed out because they're almost too small do use in a home or office. Cut it to size, bolt the seats back in and you're good to go.
I like the OEM style because its tough, easy to clean and fits perfectly just dropping it in place. The downside to those is they hold a lot of moisture forever causing rust in the floor pan.
FWIW if the OEM version is your choice eBay might have a few brand new unused ones for a decent price.
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