Ive been trying to get my hands on a specific vintage Mamiya lens for a while now but the prices on ebay are just jumping all over the place and its driving me crazy. One day it goes for $200 then the next its listed for $450 like what?? I really need a way to track these shifts over time so I dont overpay because my budget is pretty tight at around $500 for the whole setup. Im currently looking at Terapeak since its right there in the ebay dashboard but it feels a bit geared toward sellers and maybe not fast enough for real time auction tracking. I also saw something called BayShark and another one called WatchCount but the interfaces look like they havent been updated since 2005 lol. I just need something reliable for the next couple months while I hunt for these parts for a project I have in October. Does anyone actually use the paid tools or is there a browser extension that works better? Im leaning toward just stickin with Terapeak but I dont want to miss out on a deal because the data is laggy. What do you guys use to keep an eye on the actual sold prices vs what people are asking right now?