Looking through Xbox360Achievements.org, apparently
Lips: I Love the '80s has been nixed for US-release as a standalone, and they're instead making the 40 songs on it available for 160MSP each.
Let's examine how this shapes up:
Disc-based original Lips game was 60~70 USD (with microphones), and offered 1000 Achievement points.
DLC is available for 2 USD (160 MSP) each song
The existing disc-based
sequels,
Lips: #1 Hits and
Party Classics, each a standalone game, cost 50~60 USD, and offer +250 gamerscore to the original
Lips game's total available points. With these two, the total became 1500.
Lips: I Love the '80s also adds 250 points to the Achievement total, bringing it to 1750. But the game will not be sold in the USA, only the UK. 'Cheev whores amcry

Buying the piecemeal DLC does not provide access to the Achievements, which seems obvious but has surprised some of the boneheads at x360a.org
Buying the DLC for all 40 songs costs 80USD total.
The game is £12.98 (1698 Japanese yen, 18.77 USD) through Amazon.co.uk
Why can't Microsoft respect its own rules? Any full priced, disc-based retail title should have 1000 gamerscore available to it, but these only have +250 gamerscore.
That gamerscore will not be available to American players; how can MS not launch this game in their biggest territory?
Instead of piecemeal, per song DLC, why not offer the entire game through
Games on Demand?
Anyway, I've a local expat friend is from the UK, so she's having a copy shipped over from me, since Amazon doesn't ship videogames outside their immediate territory.