another option I have seen mentioned on other sites: 5 lb dumbells
I make three pounders out of mega sized muffin tins...really, get the largest aluminum tins at the market (BigLots has two tins of six muffins for a buck)....I get my lead from tweo sources....wheel weights and roofers. The wheel weights are not pure, but they are dense.....I melt the lead in a smelt pot I have (got it from Cabelas years ago for approx $35), 'skim off the paint and crud, and then pour six weights...I use heavy gauge wire from pants hangers for the loop (bent in on the ends to ensure it is secure) So, for a buck and a little time (about a half hour per six) I have anchors that will hold the heaviest goose decoy in tide and ice!!! They will also securely hold a string of foamers.