[userbinator]

If $33 is "not cheap" then you're not going to find anything lower. Perhaps an oven fan, but that's a different form-factor. The problem is that fans with integrated motors are limited by the temperature of the motor, and motors designed for high temperatures are also not cheap since special materials need to be used.

...and what's the reason behind needing such a fan?

[owenversteeg]

$33 is cheap enough for a handful for myself of course but as you may have guessed I’m thinking of releasing a product that would need them. Not a serious thing, more so a handful of bulk bought parts sold together to scratch a long standing itch in a very very specific field. Sadly $33/ea would really eat into the BOM, even on an expensive mass produced item like an iPhone that would be one of the most expensive parts.