The Diaper Genie is my (least) favourite here. Relatively cheap cost of entry ($45 on Amazon) but then the refills are extremely expensive ($7.50 per cartridge). Spoiler alert – in my opinion it doesn’t work very well at all.
Keurig coffee machines are another example. You can get a machine for as low as $75. But then you’re locked into ~$0.50 per cup of coffee. Not to mention that it’s bad coffee. And it’s terrible for the environment, so much so the creator regrets creating it.
Save a bit of money up front, pay for it (in multiple ways) in the end.