While I'm in discount and deliver mode, I've done the same to several other fish prints and a non-native fish t-shirt. Redhorse ID posters in two sizes, tiger trout (only half native) in two sizes, are $10 off. No shipping if you have it delivered to you in MO. A carp shirt is $5 off.
If you'll be at the convention, here are the sale prints for delivery:
The same items are also reduced elsewhere in the etsy shop if you want them shipped to you, but you'll have to pay for shipping.
Next week the prices go back up.