In terms of material cost it was maybe $2k at the end, but could have been cheaper (I splurged on slightly nicer versions of some things like plywood instead of OSB).
If you're even slightly handy it's a nice project to undertake. All the work is light enough on a shed that size that you can one man all of it.
It's hard to describe the primal feeling I get when I'm inside this shelter I built with my own hands. For all the back breaking work of it and all of its mistakes the feeling of satisfaction is immense.
Photo (was still working on the doors when this pic was taken): https://i.imgur.com/FogNzBP.jpg
Ever since the shelter in place order went up I've been out there working on little woodworking projects. Recently finished two small tables for around the house (https://i.imgur.com/ea67ANO.jpg) and a few misc house improvements.