Sure we can spend big $$ on a Waterfield Muzetto or Tumi bag, but I'd rather save the $250 after buying the ultimate 13 MBA. So anyone have any recommendations on more economical cases/bags that work well with 13" MBA? Also, how about a good quality leather manila envelope sleeve? Most on Amazon got bad reviews. I'd even ebay a used bag/sleeve if I could find a good one. Thanks!