This is discussed all the time. Too many 'I remember when kits were $5' type of comments. Let it go. Everything is going up in price. Get used to it. The days of $5 kits being sold everywhere are gone. Hobby shops are drying up as we transition to an online world. Also, the hobby shops around here are notoriously high. Look around online and you can find deals.
As referenced in post #2, oil also costs a lot more than it used to. It takes oil to make plastic, hence plastics kits cost more to produce.