You're right about the electronics market being heavily saturated, but no matter what product you are interested in, there will be a problem trying to match Drop Shipping as a supply method, with products that have large margins.
Few things in play here that prevents it.
Something that is usually overlooked by many, is that many products don't offer a massive margin to start with. Electronics for example, many popular electronic items have margins from around 7-15% at wholesale.
Now as you can imagine, Drop Shippers then have to make their margin on top of their wholesale price, which means that by the time you get a chance to sell it there isn't all that much margin left to start with.
Another thing that works against you with Drop Shipping and high margins is the competitiveness of a market like eBay. Even if a product does have a good margin, competition will usually see that margin slashed in an effort to find sales.
The formula that most are successful with when it comes to Drop Shipping is, modest margins, high turnover.
Two ways you can make a million in sales. You can sell one thing for 1 million, or 1 million things for 1 dollar each. Most will always try to sell the one thing for the quick reward, but quite often it's those that are busy selling the one million things at 1 dollar each that end up most successful.
Btw, no need to excuse your English, perfectly easy to understand : )