I am willing to pay $80-$100 for any of the nepenthes

https://www.wistuba.com/pricelist/index.php

This is probably your best bet. You will have to wait a while for your plants however.

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Ive tried wistuba and as i was going through the checkout and the shipping cost €60!

There are group orders for that. I don’t think there are any rn but I hope fore 1.

Anyone else has seedlings, seeds, or plants of nepenthes hamata or aristolochioides ?

I'd check ebay as they usually have some good deals. They'll occasionally pop up on the forums as well. There's a member of this forum called Jcal who I've bought plants from before and can highly recommend!