Look on ebay
Hello Bannie,
I have the same model of Kirby, and I found my set of attachments on ebay. I see box sets of attachments come up for sale there on a fairly regular basis, so I'd suggest that'd be a good place for you to start your search. Good luck!
PS, if you care for your Kirby properly, it's highly likely to out-live both you and I before you could ever wear it out!