There are some drives that read both HD-DVD and Blu-Ray available now for around $500, IIRC. I know LG makes one, don't remember the exact price of theirs though.
EDIT: Not only does LG make one, it can also write dual layer BD-E (rewritable blu-ray discs) as well as read HD-DVD.
Originally Posted by Amuro
Did I say I'm buying it now?
I don't think it would be a good idea to buy one of those for quite some time. Burnable blu-ray discs and HD-DVD discs are insanely expensive, and will remain so for a long time (currently they are upwards of $20 per disc.)