Well, I couldn't find a new ethernet card card locally because businesses have phased them out. I did however order one, very cheap and should be here sometime this week. Several of you made recommendations about serge protectors. I appreciate that. I do have a surge protector for my computer, but so far it hasn't protected us from anything. I will look into an ethernet surge protector.
Apparently however, the lightning strike did more than knock out my ethernet, I'm having trouble booting my computer. With continued storms (and a total of 3.6" of rain last week), I've been turning my computer off and unplugging it when not in use. It takes two or three tries to get it to boot up and then I get a message telling me I've had several boot failures. Duh. I've actually had booting problems since the first lightning strike, as in I haven't been able to shut the system down. It automatically reboots.
None of this bodes well for the life of my computer, which is only two years old. I'm in the process of backing up everything of value to me and wondering what we'll do if we lose our computer. But then nobody ever said life wouldn't be without it's trials!