Daniel
At such a cheap price I would not print on fiber base paper, and if you make your prints in the darkroom I would charge at least $45.00 for a 16X20 with shipping cost added to the price. One must at least make it worth their while. Also to speak for the slump in sales a lot of people are on vacation during spring, and summer, or are just outside doing other things. Fall, and winter you have more of a captive audience