There are lots of places online where you can buy site names. If you would like to find more just visit some online marketing forums and ask for viewpoints, or perform a search. Domain names are inexpensive typically around $10 a year at the most. Many sites offer sales or multiple domain reductions.
There is a lot of opposed opinions about whether or not you should get any domain with a different extension such as .net or .org for instance. Personally, I’ll use a .com, .net or .org. You’ll need to find what’s best for you, but you want to recollect something : many of us will say that consumers will forget a long URL or a different extension, which is correct but how do you target the majority of your clients?
If you are not handing out business cards and expecting them to type in the site name than it isn’t such a massive issue. Most of the traffic I am getting is either from searches or from online selling and in all cases my website visitors just have to click on a link which is why I think having different extensions has not had a bad effect on my business. bother to create your web presence, do not get mislead into thinking that going the ‘free’ route with a blog is the best way to go.