Bank says duplex apprasial is expensive ($835)due to rent schedules evaluations etc.???

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I asked if it will be an in house appraisal, drive by appraisal, or a full appraisal so I can have an idea of my costs. This is a duplex, im putting 20% down, getting a 30yr fixed mortgage.

Here is the answer I received from the bank:

-"As for the appraisal – it does need to be a full appraisal. We ordered it today and we heard back from one appraiser that gave us an estimated price of $835. Right now we are checking to see if we can find something a little lower in price. It is higher because of the rent schedules, etc that need to be done since it is a multi-unit property"-

This is a duplex and from my understanding regardless of the type of financing standard practice is that multi's up to 4 units are valued the same way single family homes are, using comps. Rents/income is only used on 5 units or more as a source when determining valuation which is where the more expensive appraisal process comes in. So I wouldnt think the appraisal should cost much then any other single family or other duplex type property.

i mean..... what should an appraisal cost?