well if you want Milspec its called paracord 550. that is what i use, but there really arent many colors. Just Black, Tan, OD and a few more. Nothing exotic and it will hyold 550lbs.
and you can get it here for
$6 per 100' hank
I ordered a Black and an OD. to make up for the $6 shipping.
if you want Colors, I would check out Tad gear
http://www.tadgear.com/x-treme%20gear/a ... racord.htm
The stuff is more expensive and not as strong and is not Mil-Spec.
It does come in some nice and exotic colors. so if that is what you wnat, this is probrolly the best place.
When you get the Paracord, you tie it like this
The Knots take practice to make, its not that easy.