I generally buy new and drive them long term. I don't negotiate. I send out bid requests to every dealer in 150 mile radius. Almost every dealer has a Internet Sales office now. I send out the exact vehicle and options I want and request a bid. Those who respond get told what the lowest bid one and that I'm doing one more round, best offer OTD without sales tax (which lets me compare Kentucky dealers) gets my business. I use the manufacturer's website, TrueCar, and Edmunds to make sure I know about all of the rebates I'm eligible for. I bought my truck new in 2012 that way and was only a few thousand over the cost of a comparable 2 year old used truck. I bought my wife's car in a similar way, but leased it for the extra incentives on leasing. At 13 months, I bought out the lease. That saved a touch over $1k over just paying cash up front.
Some vehicle types it makes sense to buy used (luxury cars, for example) but others as long as you intend to drive them for 10y + and you buy right new can be the way to go (more basic pickup trucks).
On a more routine basis, Amazon has an app for your phone that lets you scan the bar code of an item in a store and automatically price compare. I buy most of my "stuff" online anyway, easy price comparison and limited impulse purchases, but when I buy something in person of any consequence I price compare and then the store will match it. Best Buy, Lowe's, etc. will price match.
I buy most of my clothes on ebay or Amazon. Lots of new with or without tags for half or less what they retail for. Pants I generally have to try on, so I price match like above at a retail store. Suits, ebay. I wear suits to work that are $600-$2,500 retail (Hickey Freeman, Brooks Brothers Golden Fleece, etc) and never have more than $150 in a given suit. I know my measurements, so I can buy online and then take it to a seamstress to have it altered as needed.
Firearms related, reloading saves money if you shoot expensive cartridges. You won't save a lot loading 9mm, if any. Loading .45 Colt? Way cheaper.
No cable tv. I don't get a bill and I see fewer commercials to tempt me to buy stuff I don't need.
Agree on the cable TV . Ota antenna plus prime video works great.
I'll lay out my car buying strategy in a separate post.