Looking for a Sony a6400 is smart, those things hold their value but you can definitely find a deal if you time it right. eBay is chaotic because you have auctions and buy it now listings mixed together. For something simple that wont cost you anything, I usually suggest sticking to the Chrome Web Store since everything there gets scanned for malware anyway. I found PriceDropCatch recently and its pretty solid for tracking auction bids without staying glued to the screen. It basically lets you set a target price for the camera and sends you an alert when a listing hits that mark. It is free and doesnt require you to be a math genius to set up. You just install the extension, go to the listing, and click a button to start watching it. One quick tip tho... dont just track the Buy It Now prices. A lot of the real deals come from auctions that end at weird hours like 3 AM on a Tuesday. Some trackers let you see the history, but honestly, just setting a ping for when a new listing drops under your budget is the easiest way to go without getting overwhelmed. Just make sure you check the sellers rating before you jump on a low price so you dont get a brick in the mail or something weird.