I sell used electronics, computers, office supplies, and need a domain which will work. I have not had any luck.
Now a days it is hard to find an available domain under .com. you may try other extensions such as .net, .co or .biz as well. They too apealing to the public and seo wise.
You could buy an aged domain name at auction or from other aftermarket venues. Most good names are taken. If registering a new one, try incorporating your business name into the domain name. The shorter the better. There is so much competition in the electronics industry, so you'll need something that will stand out.
Use your brand name, copyright name, or trademark... that would be the safe bet. Choosing keyword based domain will be second consideration. Hope this help.
I have some software that comes up with suggestions. It`s far from perfect but I have found a few nice names for myself and for clients over the years. Let me know what your preferred names are (the ones that you mentioned such as electronics, computers etc?) and I`ll run some searches for you. : )