Aluminum rain gutters and steel gutters are among the inexpensive options on the market. However, galvanized steel gutters are slightly cheaper than aluminum for each foot installed. Stainless steel gutters, on the other hand, cost about double the price of galvanized steel gutters. It helps if you also consider the maintenance costs.
Galvanized steel gutters require periodic coats of paint to guard against rust. Steel gutters also require to be re-soldered when joints become loose with time. This adds to overall costs. Aluminum gutters, however, are rust-free, which eliminates the need for paint. They also come in seamless form which reduces maintenance work. This helps to keep overall costs down.