Buy 100 dollars worth of Steem Monster cards and hope you can sell them for steem. You might get lucky with a special gold card, or some other card that is well sought after, but then again you might get a bunch of shit cards that will only net you 25 dollars worth of steem, its all a crap shoot. It's the only two step method I have seen to converting US dollars to steem, one day someone might be able to do a pay-pal thing for direct steem purchases.

I did not buy my steem monster cards to sell, I bought them to play the game, but got burned out on the game, so sold them all. I did make a decent amount of steem doing that. I got 175 steem for one card, but that was awhile ago, so not sure what the market is doing now.