1) Economy (in this case) will be a 0.63 cent stamp by first class mail.
Like a regular letter it will not have tracking. I have had no problems sending inexpensive items this way. I do this to keep cost down & makes it more affordable for you.
2) First Class Package with Tracking. Costs a little more but you can follow the package while it is in route to you. If you want tracking you need to choose this option.
3) International First Class NO Tracking, like a regular letter, no tracking to keep cost reasonable $1.50