Seats are a preference thing. If I was the seller, I'm not going to knock off $$ just because you may not want the low seat. Just like I'm not going to knock off $$ because you don't like the tires or crash bars. No dealer I know of will swap out a used low seat for a regular one unless you just bought the bike there and not sure if you want the low or regular height seat. You can try to haggle with the seller, but you could probably find someone here that will swap you even for the seat.
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