Kohl's has the mixer for 469.99 plus tax. But you can price match to Bed Bath and Beyond, Macy's, or several other stores for $349.99. You could try to PM to Costco at $329.99, but I used Bed Bath and Beyond just in case they gave me an issue taking a coupon after, since BBB has their standard 20% off coupon. When I went, there was a long line, and they matched the price without question. You need a small filler item to get the price over $300 for the $90 in Kohl's cash. The PM is very YMMV because the color they have at Kohl's is an exclusive, so no one else has the "exact" model, but I had no issue getting them to do it for me.
After the price match, use a 15% off coupon. If you don't have one, download the Kohl's app and add the code EXTRA15. Now I do understand their official policy is to not accept a Kohl's coupon after a price match, but I have never had a problem getting it to go through. What you can do is have the coupons in your Kohl's app and just ask them to scan without saying anything. If that doesn't work try to have several items in addition to the mixer and claim the coupon is for the other items. When they scan it, it will apply to all your items.
The rebate can be found at:
Here is the math. PM to $349.99, 15% coupon brings it to $297.49, minus $70 MIR = $227.49 and you receive $90 in Kohl's cash. So it's like getting it for $137.49 + tax. Though I do understand $1 in Kohl's cash is not equal to $1. You can use my trick in this thread to give it a value closer to $1 though.
A side note about Kohl's cash that I discovered by accident. If you want it to last forever, just buy something that is more than the amount of Kohl's cash you receive. Take it back the next day using your receipt, and instead of giving you back Kohl's cash, they will give you merchandise credit. This is great for future deals, etc.
I will upload a copy of my receipt as soon as I get to a computer. I don't think I can do it from the phone app.