I wasn't exactly sure what to call them, but it's 
the case where an order goes something like this...

I would like to order XXX, but if XXX is not 
available then I would like YYY, and if neither are 
available then I would love ZZZ.

Does anyone else do this or do dealers find it 
particularly annoying? I've done this a couple of 
times when I had a strict cel budget and was wishy- 
washing between two cels. Some sites (like anime-
cel.com) seem to actively encourage this type of 
ordering, but is there some kind of etiquette 
concerned? Wouldn't want to commit a cel buying 
faux pas. (^_~)