2GB PC-400Mhz DDR RAM
19" LCD screen protector (I'm serious, anybody knows where I can get one?)
...for the 19" screen protector, you can try using the sticky plastic from stationery shops. The screen sticker/protector I got from MS looks very much like those from statioery shop where I bought to stick on soft book-covers or old style paper type driver's license. They come in roll as big as 1x1 metre with square hatching/lines on the paper size to aid cutting.
I doubt you can get any good price for the DDR RAM and 200GB HD at PC Show. Nowadays, Comex, PC Shows, Digital shows.blah blah .... don't have good deal for small items. Buy a system and you'll get some freebies and stuffs. They rather give you freebies than price discount.
Good luck. If you're there this Thursday or Friday, do post your observation here for the rest of CS'er to know. Cheerios!