As the bike sit, perhaps $100 - $200 each, depending on location and marketing skills. Cleaned up, which looks to be an easy chore, will reveal wonders and you just might wonder if you really want to sell. Personally, I would clean, lube and ride, just to see.

I should add that I am in Canada and guessing at the value in the average market. Weak markets, like where I live, a hundred bucks each (tops) but in a hot market, usually the bigger the city, the hotter the market, double or a bit more. Please keep in mind, this is nothing more than a guess.