I'm ordering color flyers for a certain campaign run at my school, and I can order 25 minimum.
If I order 25, it's $0.00 for the printing and $4.99 for shipping, coming down to about 19 cents per unit.
If I order 50, it's $7.99 for the printing and $4.99 for shipping, coming down to about 26 cents per unit.
I know 50 units is higher in price, but I don't think 25 is enough. I guess I could see if i could order 2 qty 25 and get it for $9.98, but I don't think that's possible with VistaPrint.