It probably varies place to place- but do most places charge a premium for special orders?
Regarding Danios scaring Shrimp- do you think this will be overcome by lots of plants? I have read a number of articles claiming Danios are one of the compatible fish to keep with RCS. I've no doubt you're right about them eating the young though... My shrimp population will no doubt grow very slowly if at all- again I suspect plants will help.
With planted zones and open zones- I'd expect the Danios to stay in the open and leave the shrimp in the denser areas... obviously I have very little to base this on having not kept them together and never having had shrimp previously.
My LFS does not charge me anything. It never hurts to at least ask.
I'd advise lots of plants and little places shrimp can hide, maybe a few pcs of decor...I have a bridge in my tank that the berried F and babies like to hude under until they are big enough to really venture out on their own. That little bridge is the best investment I ever made. :thm: