<div class="input-group">
        <span class="input-group-addon">$</span>
        <input type="text" class="form-control" placeholder="Some text here">
        <span class="input-group-addon">.00</span>  <!- input-group-addon class is no more -->
    </div>

    <div class="input-group">
        <div class="input-group-prepend">  <!-  for prepend - need a outer div.input-group-XXXX -->
            <span class="input-group-text">@</span> <!-  input-group-text is the new class -->
        </div>
        <input type="text" class="form-control" placeholder="Some text here">
    </div>

    <div class="input-group">
        <input type="text" class="form-control" placeholder="Input with append text">
        <div class="input-group-append">  <!-  for append -->
            <span class="input-group-text">.00</span>
        </div>
    </div>