These are best in shallow water ponds, and actually improve the quality of the water as they grow.
Punks, Bulrush, Reed Mace, corn Dog Grass
Price wise, at $7 to $10, cattails are similar in price to irises, which is another common pond plant suitable for shallow water.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.