The feed store near me sells a 10lb bag of medicated chick feed for $7 and the non-medicated only comes in 50lb bags for $65. My experience has always been that non-medicated cost more and comes in less size options, at least within driving distance, not counting shipped options. I assume the reason for this is they cater to farmed vs small backyard flocks and farms tend to use medicated because of the larger flock sizes, for a small flock it's not as "necessary".Personally, I'd not use medicated feed. Amprolium is a thiamine blocker. I have yet to read any literature that convinces me that using a thiamine blocker is not detrimental for the host animal. I am surprised that you are finding that medicated feed is cheaper. In my area, it's about $1 more/bag.
Anyhow, getting back to the topic, if your birds are within a couple weeks of laying age then feeding layer feed is fine. I personally have never fed layer, I just fed all flock with egg or oyster shell for my layers.
