Why different price for same strain?

On the sensibleseeds website, they offer a variety of different breeders to choose from. Many of these varieties have the same name. Are they the same? Because the prices's sure as hell arn't.

Thanx in advance for your guidence

some strains are better than others, more pop. ect

You'll get much better prices from a Canadian seedbank than Sensiseeds.

some banks have their own versions of strains. They are mostly the same.