I think that sounds reasonable. We paid $40 for ours at that age. I have found some good info on this site. Do a search for pigs or hogs under the other pets and livestock section and you will get quite a bit of info.
They are very easy to raise. We feed ours sweet feed, bread (from the day old bakery), and household scraps, plus any extra or broken eggs. We worm them once every 3-4 weeks. We also stopped at a neighbors that had a huge garden and got their leftovers once a week. Several grocery stores around here will give people their spoiled produce, but there is someone locally that has made claims on all that. We have even checked with a few restaurants, but haven't had luck there. Good luck and have fun.