Here’s a very simple way to get 500 free miles for your United Airlines MileagePlus account. By February 14, 2013 signup here to receive 500 bonus award miles. You agree to receive shopping portal e-mails but you could always just unsubscribe after the miles post within 8 to 10 weeks.
If you spend at least $100 USD on a single purchase you’ll qualify for an additional 300 miles.
This is a great way to get some free miles to add to your balance or prevent from expiring.