Well, we ended up back at the pet store yesterday and Carson picked out a fish! It was so cute watching him hold it in the bag and carry it to the counter, he looked so proud and nervous and responsible! He decided to name him Bubba. Later that night he wanted to change it to WeeWee, but we encouraged him to stick with Bubba. :) So here's our new $0.19 pet.
Bubba in the bag