Is it the norm to spend $800~ on tires?
Back in my old Mazda 6, I did get BFGoodrich T/A traction for $600 out the door about 7 years ago, I guess $800 is about right factoring inflation.
Any better prices for non-mystery models? (Brand names alone don't matter, actual models make a huge difference).
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1. The car is Accord 2009 coupe EX-L 18", 235 /45 R18
For quality tires in that size, no, that's actually a pretty good price. The specific size of tire has a lot to do with that. The Costco in my area would charge $749.96 for a set of Michelin Pilot Sport A/S 3 tires for your car, and that's after the $70 discount for buying four tires.
For comparison, I recently put a set of some well-rated Cooper tires on my 06 Civic EX, size 205/55R16, for about $500 installed from a local shop in the Seattle suburbs. (Costco was roughly the same price, but I try to support the small independent stores when I can. My local shop has been good to me over the years.)
I've tried skimping on tires in the past, and have usually regretted it. You really notice it in the ride quality, the noise, and the handling. I assume you bought the coupe because it's more fun to drive than the sedan; the tires are part of it! (For comparison, the same model Michelins above from Costco, sized for the Accord EX-L sedan, would be $585. For my Ford Fusion, that model isn't available in my size, but Costco has options varying from $809 to $1319 for a set. Ouch!)