You're talking about the PayPal example code, correct? We'll fix the example code in the next release so you can change it easily. In the meantime change these 2 lines:
Line 105:
<td class="large">$<?=number_format($app_price[0].'.'.$app_price[1], 2)?></td>
See the dollar sign before the "<?=numbe...."
Line 108:
<td colspan="2" id="totalline" class="large">Your total: <strong>$<span id="total_price"><?=number_format($app_price[0].'.'.$app_price[1], 2)?> per license</span></strong></td>
See the dollar sign before the "<span id="total_price">...'
We'll make this easier to change in our next release. But for now just edit those 2 lines.