The added taxes are unfortunate, but the first item in the FAQ from the funding campaign reads, in part:
Do I need to add the cost of shipping to my pledge? What about taxes?
We offer free worldwide shipping on orders, so there is no need to add the upfront shipping cost to your preorder (we pay for it).
Please note, however, that shipping insurance, local taxes, customs fees and import duties are still your responsibility as customers. If your shipping address is not in the USA, depending on your country, you may have to pay local import taxes/customs/duty fees, for example; those are imposed by your local government and Purism has no control over this.
FAQ starts about 2/3 of the way down:
That said, I hope you can somehow find a way to cover the import duties. As an alternative you could ask Purism to refund your money when your shipment is about to happen; then you could get all your money back without having to pay anything else.
If not, and the phone gets returned to Purism (i.e. if you don’t/can’t pay the import duties) you won’t be able to get a full refund, because:
While we cover the initial shipment cost, if you refuse to receive your package after it has shippped (due to duty fees or any other reason, and therefore the carrier sends the package back to us) and you request a reimbursement from us, we will deduct our initial shipping cost (the cost we paid for you as part of the “free shipping”) plus a 10% restocking fee. This includes refused shipments, shipments unclaimed or shipments with issues arising from someone other than original purchaser signature on delivery.
(From the same linked site)
P.S. That snapshot is from September 2018, but you can choose another date in the calendar of snapshots here: https://web.archive.org/web/20170101000000*/https://puri.sm/shop/librem-5/
…in case there was a different version of the FAQ on your order date. Looking at some earlier snapshots, it does appear they were worded differently. The FAQ probably got refined along the way, maybe as Purism started receiving customer questions…?