Sounds like a lot of fun stuff :)
Okay, I'm through with the amazon petticoats finally :D Looks like if you want A-line, there's tons of options, but not so much if you want something with some stand at the top.
I got three options that might work, but they're not really super cheap either... And I'm not super convinced of their shape...
this one,
this one and
this one, if you're curious. They're all somewhere around 20€ including shipping. They might or might not be a tad long (the infos are not super consistent between images and text -.-), but I figure the blunt tulle ends I can just cut shorter if need be. The interesting question is how legit the pictures are though, since at least the first two have some pictures of the skirt on a woman that are just the same pictures for both of them... And neither of them has any reviews... The last one at least has some reviews and they don't sound too bad.