I didn't even know they had a one a day. $20 for a 60 day supply is defintely reasonable. I may order them since my current multi is about to run out. I like that it's in capsule form, rather than tablet.
I've only seen NSI at Vitacost. I don't know if it's sold elsewhere or if it's a Vitacost brand. Every thing I've read about NSI has been from Vitacost, so I can't really speak to its quality. Maybe you should post your question on the Health and Fitness forum. Someone there has probably used NSI porducts.