You can still buy a PlayStation Portable if you look in the right places, but good luck snagging a memory card for it. <A HREF="http://news.zdnet.com/2100-9595_22-5671092.html?tag=zdnn.alert">High-capacity versions of the Memory Stick</A> cards that the new gadget uses to store video, photos and music have been in short supply almost since the handheld game player went on sale. Flash memory specialist SanDisk is scrambling to get more in stores.