Dirt cheap shmups on amazon US (12/2013)

[shallowgamer]

Just in case you don't check the site very often.

X360
Otomedius excellent regular: $8
Otomedius special ed: $14
Akai Katana: $14
Deathsmiles limited: $16
Looks like you can also import dodonpachi resurrection pretty cheap from 3rd parties as well.

PS3
Under defeat :$29 (it released at $30, still a steal in my opinion)