I’ve been digging around online for some kind of record of past Amazon sale prices but haven’t found anything. I want to pick up an S9 GPS which is currently on sale for $349 at Amazon, but I’m not sure if I’ll end up regretting not waiting for Black Friday.
You can search dozens of site, like Keepa.com, for historical Amazon price info. In addition, sites like slickdeals.com allow you to search their posts by date so you can see what happens to prices during BF.