Craigslist! Some people just can't get rid of their huge stock bedrails! I've stil got mine and used them as a painting experiment! LOL. I will say though, they look good on some trucks, and don't look good on others.
BUT.....If you wish to ditch those huge things, I suggest getting Bushwacker bedrail caps and a tailgate cap. They cover up where the factory ford ones eat up the paint. They're about the only ones wide enough that I found that would do that. Plus, Bushwacker is a local company to me and I like to support local businesses(Bushwacker, Warn, etc).
I got 'em from a local off road shop, but you can order them up from a bunch of different online retailers. The bed rail ones run about $80 and the tail gate runs about $30. Here's some links:
(looks like prices went up. I bought 'em 3 years ago. lol)