I ordered it from a dealer in Chicago, it seems that many dealers participate in an online store that offers discounts off MSRP for parts & accessories that can range from 0-15% off and various forms of reduced cost shipping for certain size orders. The cam has an MSRP of $299, but you should be able to find it in the 10-15% off plus free shipping price point. Most of these same dealers say that the pricing is "on-line" only. Just be careful that many of the sites will suggest the Venza wiring harness is required because the public facing parts fitment system is not up to speed with 21 Sienna, and the cam was first promoted for the Venza.
I did this, because all the sites indicated the wiring harness was necessary, and the Dealer in Chicago caption it as for Venza and Sienna, bundled with the wiring harness because it was required. So when I got the cam, and requested the install guide - it was for a Venza. I wrote my original post thinking the Sienna install was going to be similar (requiring the wiring harness), but called the dealer back and asked if there was instructions for the Sienna. Then I got them by email and carefully read them - NO wiring harness required as it was a direct plug in the the blue connecter there for that purpose! So I did the strike-through edit on my post so that those who saw the original would figure it out.
So at the end of the day, an OK cam, that looks like a factory items, with a simple plug n'play install for mid $200s I thought was a good value. But those with your Siennas can put a volt meter on the leads of the blue connector and I suspect that this is at least an always hot 12V, ignition switched 12V and a ground in that connector - an easy wire-up for any aftermarket cam - but will require some cutting and splicing of wires.