Are you dropping service? Have they been replaced?
If you are dropping service for them, you can just go online and remove them.
They will end you a box to ship them back
Just make sure to keep tracking number to prove they were received.
If you really would prefer a store, check with your local Verizon Wireless store )make sure a corporate store and not a reseller). They may also handle FIOS or can tell you where the closest one is.