Yesterday retailers Dollar General and Rue21 both went public. Last month Vitamin Shoppe did the same.In general initial public offerings are making a comeback. But these three companies are particularly attractive to investors because they all represent value to a consumer that is strapped by the recession.Dollar General, of course, operates a massive chain of dollar stores across the country. Rue21 sells teen apparel at low prices. Vitamin Shoppe is perceived as a value chain by some because shoppers flock there looking for preventative health care ideas.Many landlords are pretty familiar with all three of these chains because they are some of the only outfits rapidly expanding right now, and more cash will likely fuel additional stores. Value seems like a safe bet right now due to the state of the economy, but if this recession starts to wane, will the excitement for these concepts continue?