I actually used to have an online audio store which dropshipped, and it's very hard to be competitive with the high prices of dropshippers. I have learned that a persons best bet in ecommerce is to establish a unique niche and focus on a few products, such as lifeisgood.com started out with just a few shirts and have significantly grown since,
http://heterowear4u.com/ has a very unique and defined niche, or lunacandle.com which offers solely one type of product which is very unique which is color changing candles. Each of those stores can stock their own products and significantly increase gross and net profits, and have a much tighter control over inventory and shipping times and costs which helps a lot. Find a unique or untapped niche and offer 3-7 products, and you'll be set. Easier to market, and easier to sell because everyone wants to buy from the specialist.