lg 300g snap close belt hook case, ebay, $3.24 +/-
http://cell-phones.shop.ebay.com/i.html?_nkw=lg+300g+case&_sacat=15032&_dmpt=PDA_Accessories&_odkw=lg+300g+cases&_osacat=0&_trksid=p3286.c0.m270.l1313
you can use "power save" from 'settings' menu scroll down to #6
control both ringer volume and handset volume, as well as 'keytone' volume from 'settings' menu #1