what is an ATtiny 13v microcontroller and where to get it?

ive been trying to make the lucid dream mask from guyfrom7up but i dont know where to get this component. oh and i live in the uk.

It's a dirt cheap AVR microcontroller. You can get them from one of my favorite sources, SparkFun Electronics.

You can get the ATtiny13 here: http://www.sparkfun.com/commerce/product_info.php?products_id=211

You're also going to need an AVR programmer for it. Those can be found at SparkFun as well: http://www.sparkfun.com/commerce/advanced_search_result.php?keywords=attiny&x=0&y=0&search_section=products

Good luck!
Farnell stock it.