Just wanted to tell you all about my experience.
So, I've been looking for airfare for our Nov trip. Yesterday I purchased 1-way tickets for our flight down. Fare was $154 plus taxes & fees. United allows you to get a full refund within 24 hours of original purchase. So, this morning I check prices, fares went down to $144, so I did the refund and repurchased at the lower fare. This afternoon I checked again, guess what, prices went down again to $104. So I did the refund and repurchase once again. I couldn't believe it. So excited!