Blanco was what the team formerly known as Rabobank and now known as Belkin were called during the period when they were without sponsor. It didn't last for long, so if they are a bargain then it's probably because they are replica kit for a team that doesn't exist ... sort of.
I remember thinking at the time "I'll keep my eye peeled for replica Blanco jerseys, I bet they'll be good kit going cheap". But then never did.