Patient fans of The Beatles, your wait and see approach to the originally high priced The Beatles: Rock Band has paid off. The MTV Games and Harmonix music game is now much more reasonably priced.
You have two options today. You can choose to take advantage of Amazon.com's "Deal of the Day," which is blowing out The Beatles: Rock Band limited edition bundle for the Xbox 360 for $124.75 USD or for the PlayStation 3 for $134.65 USD. For just $28.49 USD, you can grab a copy of the game itself for the Wii, PS3 or Xbox 360.
Your other option is to buy direct from MTV's Rock Band Deals page, which will be selling the PS3 and 360 Beatles bundle for $139 USD. The site also has bundle deals on Rock Band 2 and the original Rock Band that should be very attractive to the frugal late adopter.