Thinking I might just buy a used one at the local used game emporium.
I plan on going today. Thinking I might go for a midrange wired controller -- Mad Catz, Razer, and Hori all look like they've got good options. If I went Mad Catz I think I'd probably get another Street Fighter controller. (I've got a wireless PS3 one that I use on the PC and I'm happy with it as long as I'm not trying to use it for something that wants an analog stick -- I tried using it for Majora's Mask, because of the sorta-N64-like 6 face buttons, but I was disappointed.) Hori's also got a
wired controller with 6 face buttons that might do the job and also has analog sticks.
Not that I play a whole lotta SF and the like on the 360 but I DO have that Capcom Digital Whatevermajig pack with SSF2THDROMGWTFBBQ, and I saw a copy of UMvC3 at the used game store the other day. (Used => acceptable under my "no money to Marvel for exploiting Kirby" boycott.)
EDIT: Oh snap, Amazon's got that
WWE stick for $35 again.
EDIT 2: Found a basic wired Mad Catz controller on clearance at Target for $12. If I get a new job I can buy all sorts of crazy controllers, but in the meantime this'll get the job done. D-pad is acceptable; I can do Shoryukens with reasonable precision and do not accidentally move things to the right or left when pressing Down in falling-block games.