Heads up, deal hunters! There's a way to potentially snag an extra $100 on top of the ongoing 4% bonus when you sign up for something (the article doesn't specify what, but context implies some kind of investment or savings account). The trick is to use a referral link from a friend (or a generous internet stranger!). Here's the catch: If you're using a referral link, you won't automatically get the 4% bonus. You need to manually enter the code `BIGDEAL` on the application summary page *before* you fund the account. Failing to do this means missing out on that sweet bonus! Why should you care? Well, an extra $100 is an extra $100! Plus, the 4% bonus can significantly boost your returns, helping you reach your financial goals (and maybe fund that dream vacation!) faster. Don't leave free money on the table – follow these steps carefully!