Can I get sponsored by a company?

I'm 13 and recently I've built a computer, won the tech fair, and I'm moving on to state( no national). I wanted to know is someone ( a computer company) will sponsor me when I go.

The odds would seem small, better if you did some genius engineering and didn't just add pretty lights to a PC case. You might try writing up a press release detailing the upcoming event and what you did to get there, there are free press release distribution sites that probably won't get it into the news but some computer biz people might find it in a web search.