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Mail order tire specials are the shit for quads, prolly about $250 for 4 tires and 4 rims.
here is a good local place to get deals but you'll have to use their mail order to get the good prices.
Also bluetraxx is a yamaha ATV specific forum, lotta good usefull info there, just be carefull what you say around all the kids, it's heavily moderated. None the less, lots of usefull reading