.../ I don't mean to sidetrack your post..
Years ago I posted a real question about a life move on BGOL (before the business section was even around). I ended up getting feedback on the subject and it weighed in to my final choice.. I believe it ended up helping me out. A few years after that I came to BGOL to see if I could find a way to make a few dollars. This time I didn't post anything, I just read and I found something that helped me out. These days I come to BGOL once in a while to look

and read to see whats going on.
I read your post and know someone is reading it and knows a solid, legit way to flip $100... I want to offer some advice but I honestly don't know the best way to turn 100 into 200.. If history repeats itself, on BGOL, for you like it's done me you'll stumble across something that makes sense to you, something you feel is worth trying. Or someone will drop a jewel here with something that you feel will be worth trying..
Tips I'll share:
IF you catch on to something people need and you figure out how to present it right, there is money to be made/
Businesses that recently caught my interest..
(service related, people need it so why not sell it)
/home window repair (a small business owner recently told me he can't keep up with the work, his shop is in a blue collar, visible area.. that triggered research time for me)
/moving company
/ barbershop (location is the challenge, too many shops already in the area or no solid need for one in areas that aren't saturated...
Good luck! I know my thought's don't relate to your question but hopefully someone will hit you with a gem or you will find it on your own.... $$$