I know that getting to the music store during business hours can be difficult. If you must order items online, please use the following sites. They have reliable shipping, customer service, and warranties. Yes- you can rent instruments online through some of these sites!
Please avoid buying instruments on websites such as Amazon and Ebay. It is hard to see what you're actually buying. These instruments are often hard to play or need repair beyond the value of the instrument.
Recommended websites:
http://www.sharmusic.com/
http://www.swstrings.com/
http://www.jwpepper.com/5991441.item#.V8XQf0zR_IU