Honestly, I totally get the frustration with those wild price swings on eBay. I was looking for a specific vintage lens last year and I saw the exact same thing happen... one guy wanted fifty bucks and the next wanted three hundred for a broken one. I think I found a few things that help keep me from overpaying tho.

• CheckAFlip (IIRC it shows a comparison of sold vs live prices)
• WatchCount (not sure if it does full graphs but it shows popular stuff)
• The Sold Items filter on eBay (works well enough and its free) I am usually pretty satisfied just using the sold filter because it shows what people actually handed over cash for, not just what sellers are dreaming of getting. I think there was another site called Average Finder or something similar? Not 100% sure but I heard it mentioned in a group once. It really helps me feel better about my bids.

> I just want to see a simple graph of what these things actually sold for over the last six months Caught this a day late but like someone mentioned, tracking these specific models can be a nightmare because the data is so noisy. In my experience over the years, I have tried many different ways to scrape auction data for vintage electronics. It is rarely as clean as Amazon. The TRV900 is a classic example where condition and head hours change the valuation significantly. A while back, I was on a hunt for a specific high-end DAT recorder. I realized that simple price aggregators often fail because they dont distinguish between a mint unit and a junker. My current setup involves manually filtering for sold listings and then dumping that data into a local spreadsheet. It takes work, but it is the only way to get a true sense of the market floor. Honestly, it is kinda the only way to stay sane.

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^ This. Also, yzjkvndqzo is totally right about the TRV900 data being messy... basically you're looking at a legendary 3-CCD prosumer cam that everyone wants for that vintage look right now, so prices are all over the place. In my experience, no tool beats manual filtering for reliability when condition matters this much. Here's what I do:

• Filter by Sold Items and then sort by Ended Recently to see the actual market clearing price.
• Ignore anything listed as Parts or Not Working because those skew the averages way down.
• Check the description for firewire port tested - if they havent tested the port, its a paperweight for transferring footage. Usually if you see a $400 one sitting there, its just a delusional seller hoping for a sucker. Stick to that $150 budget, it's definitely doable if you're patient. btw if you're ever coordinating gear buys with friends, Cart to Link lets you share an entire Amazon cart as a link which is super handy. Good luck hunting for your brother, those TRV900s are absolute tanks if you find a good one.