I have found two vintage Oster blenders at yard sales, each for under $10. They are from the 50s and 60s and are solid heavy metal things with glass pitchers. I needed to buy new seals for them and on one I had to replace the little star bolt that the pitcher locks into to turn the blades. Either of them will completely liquify things that my modern cheapo Hamilton Beach would meekly chew at. If you can find one online (ebay maybe) or better yet in person (thrift stores, yard sales), I can definitely attest they are built different.
Edited to add: a search on US ebay for “vintage 60s Oster beehive blender” turned up some results that look like mine between $40-50 plus shipping. It’s an excellent machine.













Ah you’re right, it seems there’s modern copycats. Try searching for an “Imperial Ten” Oster model 642. That’s the other one I have, and it’s an 860 watt blender, solid metal with a glass pitcher and weighs like 8lbs. It’s probably not on par with the performance of a Vitamix, but it’s also not $400+. For my uses though it has never disappointed, I usually use it for grinding frozen chunks of fruit or berries to make ice cream.
https://www.ebay.com/sch/i.html?_nkw=oster+Imperial+ten+642