Where can I buy old dentures to make my own to fill missing teeth - i have a job-that disqualifies me for char

I dont make enough for dental insurance and I have a job-that disqualifies me for charity dental care-I can make my own if I can find old denture teeth to make them from-I have had a piece of plastic epoxied in the front gap for more than a year , but it fell out the other day-I am using jb weld now but I want to try and make some that wont be so obvious-Thank you