Anyone selling something can dictate their own price simply based on their work, market, supply and demand if the price don't fit you, all you have to do it shop around knowing that when it comes to F/T the only way to make it worth when ordering online is to buy bulk 100 or more feeders.
So what happen when price are too high for your liking and it puts you in a bind? Well same thing than before you have options.
1/ Breed your own feeders (I would highly recommend that you get your parents approval before starting in this venture if that is your choice).
2/ Get a job, do chores around the house etc to afford the feeders.
3/ Re-home the animals if they have become of financial burden.