When starting out, we don't recommend selling electronics as this is an over saturated market. Most sellers on eBay that actually succeed selling these products are wholesalers themselves buying direct from the manufacturers or those who buy off liquidators where they get products for pennies on the dollar. Having said that it is difficult, if not impossible, to compete if you will be using drop shippers because when you are drop shipping, you don't really get volume discounts.
So have a look at the recommended suppliers listed on the link I have provided above and check out your competition on eBay. You may also do a Completed Listings Search to find out what the average selling price and the sell through rate of these products. You can do this by typing in the keywords in the Search Box and clicking on the Advanced Search link. The wholesale price needs to be at least 20% lower than the retail price in order for you to make money.
It's great to have you here! There's a wealth of information here waiting to be unraveled so have a look around :)