I would check Craigslist for another chick, maybe even post an ad that you are looking for one.
I was just going to suggest this. We have a local classifieds website too with its own poultry section. Tons of people are getting rid of their chickens of all ages.
Some of the ads make me laugh. One woman was selling her chickens because they were "getting too big". They were still in the brooder!
Good luck to you, I'm sorry more of your chicks didn't make it, but glad one did. Welcome to BYC!