The text below is just a rip from Jacobs update but TLDR, you can now click a link to buy the thing.
"Books are on their way to the US warehouse, and are expected to arrive on April 8th, 2019.
If you live in the US, and only want the book itself, they should begin shipping out shortly thereafter. It may not be immediate (see below), but it will happen rapidly.
If you live outside the US, a pallet of books is being held in limbo until April 22nd. From now, until April 22nd, we will be pre-selling books for international customers. At the end of that window, we will ship the books that have been sold (and some spares, just in case) to the UK. Once they arrive in the UK they will begin shipping out around the world.
International shipping rates from the UK to the world are much much better than international shipping rates from the US to the world, so if you have any friends who missed out on the Kickstarter and don't live in the US, this pre-sale period is the time to jump on and grab a copy! Once the pre-sale window closes on April 22nd, all subsequent international orders will ship from the US, and shipping prices will increase accordingly.
We are considering doing some international friendly pre-sale events two to three times a year, so if your friend can't pick up a copy now, don't despair, there will probably be another opportunity at some point in the autumn"