another option, and one that is excellent for tide and current, but also great for long-lines in calmer waters.................get the aluminum extra large muffin tins (about 99 cents for a pair of six packs).......make a loop with heavy guage wire or even a suit hanger....pour your lead and set the wire (I twist the ends so the hold power is increased)....the anchor will peel out......since the tins are so cheap they are disposable......the anchor will be about 3 pounds and will hold even the largest goose floater in current or a string of eight divers
other than that, I do not know of any commercial molds other than those stupid strap anchors....and those are available through Cabelas or Basspro I believe.........maybe Knutsens has them