China is the 9 day shipping component. I use JLCPCB most and SeedStudio because depending on the features each has their own pricing benefit. If you are comfortable with a paste syringe and the component count is small you can skip the stencil and order multiple projects at the same time to seriously save on shipping. Youtube has great videos on stencil pasting and reflow soldering with a heat gun. If you aren't familiar with EDA software you can start at Fritzing or EasyEda and move on to Kicad. Altium is the standard at big businesses.

Here is an example of an MCU based tilt sensor I made earlier this year. I have about 12 hours total into it including inception/design/layout/soldering. It would have taken me 12 hours to breadboard it with components I couldn't use in production. I do this a lot so my process is rather streamlined. I made about 25 boards this year, mostly small test circuits. https://imgur.com/a/XJxp0tO

Go with OSH park instead of China. Their support is gnebuinky amazing, and the service in general. Is 5 days for a 2 layer board with 5 dollars per square inch of design for 3 boards, and free shipping.

The company is active on Twitter and its founder is awesome based on interviews he gives with various electronic podcasts.

+1

I’ve been using OSH park for the last few projects. Way easier to get started (they take Eagle files and supply design rule files), quick shipping, amazing support.

In the past I've used AP Circuits (https://www.apcircuits.com/home.aspx) and E-Teknet (https://e-teknet.com/) with good results from Eagle CAD pcb files. It has been a few years though, so YMMV.