I don't know about other lfs, but mine will try to order in for me whatever I want - if their supplier can get it. So, if you're having a hard time finding the multies, you may try ebay or aquabid - and there may very well be other auctions that I am unaware of - to find them, but then you will incur shipping charges. But you also might ask your lfs if they would be willing to order the multis in with their next order/shipment for you. I don't know where you are located (I'm in Oklahoma), but I also know of a guy here who can order just about anything, and he will ship anywhere in the US. So, if you can't seem to find them, PM me and I will give you his email addy.
Good luck!