The invoice prices on our site always match the price listed in a booklet prepared by the vehicle manufacturer and distributed to its dealers commonly known as the "dealer order guide".
I'm assuming by your member name that you are in Idaho and not in the Southeast or the Gulf states (the dealers down there impose an additional administration and destination fee which raises Toyota's national price by ~$1,000).
An easy way to check is to look at invoice prices at Kelley or NADA. They should match our number (some sites may or may not include destination in the invoice price, so you may have to add in the difference of $810, which is the current Toyota destination fee).
Everyone pays destination so your invoice number typically will include that. So for a Sienna Limited with Convenience and Navigation, the invoice should be $39,773. ($36,863 base plus $748 Convenience and $1,352 Navigation, and the $810 destination).
Please report back and let us know what the dealer's explanation for the extra $867 is.