www.cranesbillnursery.com is a nursery that specialises in them. The only snag is you have to pay carriage. But there are a great many varieties and something for most situations. When you say "the pink and the deep blue" - well, there are many of each, all slightly or very different. Some enjoy some shade and others like full sun. So have a look at the website and see what you fancy. Some are very low growing, some are tall and get rather floppy, some are in between. There are a few double ones (eg Southgate Double, which is a pretty pink)
A very few are evergreen but most disappear in winter.They are mostly very easy to grow. You don't say where you live - there may be someone near you who might give you some bits to grow on.
Rozanne is a recent medal winner and beautiful.

Fill yer boots

http://www.crocus.co.uk/search/_/search.geranium/sort.0/

They're not really readily available from seed but try googling it and you might come up with something

Many thanks for taking the time to reply