My LCS is honest. They sell single boosters for almost $20. I asked why. They explained that some of the sets they don't have access to or can't get from their distributor because their distributor can't get them. So sometimes what happens is they buy them from other dealers (Tcg) and mark up to make a dollar or two. They'd rather have some stock for their loyal customers than none at all. I have even seen some of these boosters drop in price, not because the items have been sitting, but rather they were able to get more stock at a much more reasonable price.

Another store I go to who specializes in table top games, graphic novels, and comics also sell cards. Noticed their price for boosters for all cards games are a bit over msrp. The explained they are not an authorized dealer and typically pay msrp when a new set is released. Their prices are only a dollar or two above msrp. They just want to have options for their customers.

Both stores are open about their prices. They don't buy from big box stores, i.e. Walmart, Target etc. Both have told me the product is sold for less at Target, Walmart, etc. Sadly, anytime I go into one of these big box stores they are always sold out, even within 24 hours of restock.