How about 2 bucks ? I have a double cud that Someone gave me free. I know. I know. Good for me. I just think 8 bucks is full on Retail. Try Etsy for that amount ?
It is always best to have an attribution reference, here is the relevant section, http://cuds-on-coins.com/jefferson-nickel-cuds-1984-1989/
According to https://coinsite.com/us-error-coin-values/, $5 to $10 for a Jefferson cud. I would assume the smaller the cud, the least value.