My take on stretch goals:
Start the stretch goal at $20K instead of start at $50K, and mark first few already completed. Start the ranges being 5-10K then increase to 15-25K as get higher up the more expensive things get.
Suggestions I like (in order)
Audio book would be great, don't like Audible but whatever platform works. Google / Apple also has audio books, but again, Google / Apple <=> Audible??? Big corporation bad type of thing?
Like a podcast about the book, or things that went into the book, or behinds the scenes of the book, or things that wanted to include but didn't fit anyplace, but make it for everyone
That book party thing and could record podcast while Shaun is there!!
Coloring book thing added as addendum (see below for New Suggestions)
Bookmarks, maybe throw that in as a gimme if decide it, for physical copies. Could go
cheapie extravagant route and have signatures printed on them too...
Draft copies of future books be OK too
Suggestions I dislike:
Autographed copies. Maybe add in as a reward, don't include as a stretch goal AND a reward.
New suggestions:
Add addendums to the book, maybe not by you but by guest author's (little late for this though idea for next one(s))
Add other e-books covering topics in more depth, like the $50 house one (Mike Oehlor?) by working a deal with the author. Give them a few bucks and include their full book.
Add couple pages of color photographs (in an addendum) to illustrate important topics, such as the Wofati, or Rocket Mass Heater, recycling 4.0, micro-hydro, etc.
A course (weekend?) at Wheaton Labs on some principles contained in this book. Not a PDC but more like a "how can I be a better city dwellar steward" course.
Create YouTube short video series on different chapters that the average person at Wheaton Eco Scale 1 or 2 can do to bump them up a notch or two
Hard cover edition (looks like this is soft cover?)
Blank page(s) at begin / end of chapters / book for notes
Make sure e-book is printable
A meet the author's weekend at Wheaton Labs, with the book stuffing party included (add weekend as a reward?).