where can these be purchased in 3/8 dia. and be white in color?

Far as I know they don't sell white anymore, but there are a lot of guy's on the board who are always willing to help out with a supply of rod. I use grey, though, and after I load it up with yarn and bait butter it's pretty hard to tell what the original color was

Yes, they still sell white, have to buy a ton of it though, have lots in 3/8" if interested give me a shout and i'll be more than happy to give you some, (for your favorite zipperlip) (jk) let me know if i can help, Doug

Might try the vision link / ad the top of the page ... Joe had a bunch

Vision sells it directly and Ted's in Lynnwood carries it as well.

Does anyone ever come across the real small stuff, like maybe 1/4 inch or smaller, about the diameter of a pencil?

I would LOVE to get my hands on some of that