I haven't seen a deal that low for an AW S3 GPS, but maybe there was a refurb out there at that price. You have to be careful from whom you buy refurbs though. I would always trust Apple refurbs (
https://www.apple.com/shop/refurbished), but not from other vendors including Amazon. Apple's come with a one-year warranty (same as new) and are eligible for the same Applecare+ plans as new products. Knowing the details about other vendors' refurb return policies is an important factor to consider.
For buying resources, I cruise:
Before you buy an Apple product, make sure to check out our deals roundup to find sales and get the best prices. We have price charts for Apple's...
www.macrumors.com
This page provides a product summary for each Apple model. The intent is to provide our best recommendations regarding current product cycles, and to provide a summary of currently available rumors for each model. This page is based on rumors and speculation and we provide no guarantee to its...
buyersguide.macrumors.com
Find the best deals on MacBooks, iPads, iPhones, Airpods, and more!
prices.appleinsider.com
Shop Best Buy for electronics, computers, appliances, cell phones, video games & more new tech. In-store pickup & free 2-day shipping on thousands of items.
www.bestbuy.com
I'll use Amazon for price comparisons, but for some electronic items I won't buy from it (even though I have Prime) because of the return policy. Apple and Best Buy's policies--and even Walmart--are much better.