As for sony, it uses Memory stick as it's storage medium which the price still quite expensive.

and olympus use XD card which is still not very common and that the reason the price still higher than normal CF or SD Card.

If you not urgent to get it, i suggest you to wait for 1-2 months, this week PMA held in US, big camera brand like nikon, canon, panasonic.... they release quite a number of new model. you can check it out from URL below:

http://www.pma-show.com/
http://www.dpreview.com/