It's been ages since I've posted deals here, so please be kind if I am forgetting any details. Anyway, ran across this offer today --
Boost your savings with a $100 Bonus
We want to help you get even closer to your savings goals! Get $100 when you deposit $10,000 or more in new funds into a new or existing Online Savings Account within 10 days of enrollment, and maintain those funds plus your current balance for 90 days. Must enroll by 3/18/19.
Now there are better checking/savings offers, but this is one of the few I have seen for Marcus. I also think current customers are eligible so long as the 10K is new money.
Savings rate is 2.25%, which isn't the highest out there, but it's not bad either. I signed up earlier today, although the site was having some technical issues ... ended up getting the acct via phone. It was super easy though, just took a couple of minutes. Set up an ACH transfer, and it should be a quick $100 (well, quick to earn, 90 days of waiting).