I picked up some factory second/overrun fly line last time I was in Denver for a trade show. I tell you what....the price is right! You can get it from Discount Fishing Tackle for $9.50 (WF and DT) and $10.50 (Sinking), Even the postage is a deal. at $3.95!
You cannot order it on their website, so you have to pick up the phone or visit the store. Rumor has it the line are all made by SA. The color may be lighter than the retail line and I heard a few guys mention a small rough spot.