I currently have two of these and I found seeds today, quite surprised by that find. I'm really fascinated by this plant. Does anyone else grow them? One of mine is doing great and another went a day without water in 40 degree celcuis heat and hasn't come back too well but actually I think it may be a little too hot for them here in summer, Perth WA. I'd love to get my hands on some of the different flower types. I think mine are the standard honeycomb style.
Celosia are sold as bedding plants in N. America and are easy annuals from seed. It is an old fashioned favourite, I guess - I don't think they are as commonly grown as they once were. The plume type have become popular in recent years. They do well in heat. You should be able to find seed online.