If you travel back that far, there’s no need to buy them. Just start mining them. It was super easy at the beginning. I kinda wish I hadn’t been so lazy back then and done it myself.
Besides, I’m not sure there even was $100 worth out there available to buy at that price.
Pro Tip: build a time machine, travel back to 2009, buy $100 worth of bitcoins at $0.00076 each, sell in 2013 at $1000 ea (roughly $130 million).
If you travel back that far, there’s no need to buy them. Just start mining them. It was super easy at the beginning. I kinda wish I hadn’t been so lazy back then and done it myself.
Besides, I’m not sure there even was $100 worth out there available to buy at that price.