Got a dozen seeds from Amsterdam 25 years ago. Every few years hang on to a male for pollinating a few gals and never had to pay anyone a dime since. They grow outdoors great during the summer but won't flower until days are short enough and by then too cold. Take out the males (unless you want one for pollinating)  and throw the gals under indoor lights in fall to cut down on light and force them to flower. Two months and you be set for the year. Seeds stay good for up to 5 years if kept in the fridge. Tax this (grab my junk).