No issue with buying just 1BTC to sell as far as I am aware
are you sure ?
Minimum balance limitations
You need to have at least the advertisement minimum sell limit and 1 BTC available in your LocalBitcons.com wallet.
This is a copy paste from localbitcoin.com
Here is a link :-
https://localbitcoins.com/guides/how-to-sell-bitcoins-onlinethe text is half way down.