if you would rather buy a rodents and kill it yourself, that is fine. but that will be more costly. also rodents purchased from a pet store are more likely to be unhealthy and carrying parasites or disease. in my opinion, f/t is better because the company you buy from is (should be) dedicated to breeding the healthiest rodents that cost alot less. im pretty sure these are the only things wrong with buying them and killing them yourself. so hopefully that will help you decide.