Most of my SD fy cels cost $50 or less, from both 
the OAV Omake and TV series. I would watch the 
more reasonable dealers like Chaos or Anime-taro, 
as I've gotten SD cels from the both of them in 
the past. They're hard to find, but the lack of 
detail usually found in SD cels shouldn't make 
them more expensive. :P

Course, I may just still be living in the sane fy 
collecting world. >.<;;;