During the dead of winter a salad can be a challenge if you are trying to eat seasonally and economically. 

You can try some of these for a change from iceberg.
  
The endive (also known as Belgian Endive, Witlof, and Witloof) - High in Dietary Fiber, Vitamin A, Vitamin C, Vitamin K, Thiamin, Riboflavin, Folate, Pantothenic Acid, Calcium, Iron, Potassium, Zinc, Copper, Manganese, Vitamin E, Magnesium and Phosphorus

Chicory (sugarloaf or radicchio) - sugarloaf is sweeter tasting. It is a good source of Thiamin, Niacin and Zinc, and a very good source of Dietary Fiber, Vitamin A, Vitamin C, Vitamin E (Alpha Tocopherol), Vitamin K, Riboflavin, Vitamin B6, Folate, Pantothenic Acid, Calcium, Iron, Magnesium, Phosphorus, Potassium, Copper and Manganese.

Lamb Lettuce - 5 ounces contains contains 95% of our recommended daily intake of vitamin C.  It is very rich in provitamin A (100 g is almost enough to satisfy your recommended daily intake!), rich in vitamin B9 and C.  In addition, lamb’s lettuce contains fairly significant levels of calcium and phosphorus.

Cabbage - Cabbage is an excellent source of manganese, calcium and potassium. It is a very good source of iron, phosphorous, magnesium. It is also a very good source of fiber, folate and omega-3 fatty acids. Further, sodium, zinc and copper are found in good amounts in cabbage. Cabbage is an excellent source of vitamin C. Cabbage is also a good source of thiamin vitamin B1, riboflavin vitamin B2, niacin, vitamin B6. It contains good amounts of vitamin k, folate, vitamin A and protein.

Celery Root - good source of Riboflavin, Vitamin B6, Pantothenic Acid, Calcium, Magnesium and Phosphorus, and a very good source of Dietary Fiber, Vitamin A, Vitamin C, Vitamin K, Folate, Potassium and Manganese.