grumpy old man doesn't understand world he lives in, "film at eleven"

 So I bought a replacement Y-axis belt tensioner.  It is made of aluminum and weighs sixty grams.  I don't think the extra mass - presumed extra mass, I gotta take the old one off to weigh it - will be sufficient to cause problems.

 It hasn't been installed yet because of ongoing severe back pain which has kept me immobilized for several days.  For under ten smackeroos I couldn't be arsed to make it from scratch.

 In the mean time, I've been shopping around for filament dryers since the filament I've had sitting around for five years is now showing signs of humidity absorption, and I was hoping that post-holiday prices would drop.

 I had half-settled on one, and even had it in my Amazon wish list, but then the price bounced up and I decided to see if it was just that vendor or everybody.  It was just that vendor, so all well and good, but then I found the ringers which really prompted this post.

 So the unit I'm looking at typically sells for ≈ $160 US.  You can get it as low as $102 direct from Aliexpress, or a bit higher if you choose Amazon.

 But two vendors want more.  Much more!  One eBay seller wants $700+ and another $900+.  I thought maybe they were selling four or five units, or throwing in a free printer, but they are not.

 It's not the first time I've seen this.  Can anyone explain what's going on?  The high flyers are usually on eBay, not always.  Shoppers are not stupid, they aren't going to buy that when the same unit normally sells for 1/4 of that.  Unless it's a money laundering scheme?  My dumb ass is not very good at thinking up successful criminal enterprises, or I'd be a lot wealthier.  IDGI.