If you do a search of my posts I have bought CycloDS cards from two different places, one was Modchip-Store.co.uk, can't remember the other one although it is in the post.
Modchip-Store.co.uk do them for about £35 each. IIRC there was a bit of a wait (about 3 weeks) because they didn't have any in stock but it did work fine.
Hope this helps, I have bought other stuff from Aria (in fact I'm awaiting a delivery from them at the moment) but they do seem over priced for the CycloDS considering how much other places have them for (between £30 and £40).
EDIT: Just found my earlier post, turns out the other place was ConsoleUp.com but it looks like they don't sell them anymore.
I don't suffer from insanity - I enjoy every minute of it.