IMO, what works best is placing an order at a pps that you hope to buy it at, between the bid and ask based on fills you are seeing, then enter it as "good until canceled." With Fidelity, the order is good for 90 days and it's a one time commission of $7.95 for any qty. It may take a few days, but it fills for me every time. I have never placed an AON order for EDIG or anything else, and the comments here are consisitent that it seldom works.