ritepath; you can see what the fair prices are. Hell, just do an online search. We know that some of the wholesale prices have gone up. That's understandable. And it's understandable that the local merchant has to raise the price a little. You bought ammo at $18-$20 at a gun show. Well DUH, gun shows are probably the HIGHEST place to buy ammunition right now. Where do you think all those people who bought all the Wal-Mart stash is selling it.
If your local retailers are selling 9mm for $20, then they are rapists. Please don't use gun shows as an example. I expect local shops to be a little more than ordering online. They aren't buying in the same bulk, plus they have shipping costs and need to make a profit. But when you can see a difference of some online/retail shops selling at $16-$20 and others; like cheaperthandirt, ammunitiontogo, and others selling at $29-$49; then there's a difference.
But also to reiterate. Gun shows are a great place to buy guns and gear. And under NORMAL conditions, they are a great place to buy ammo in bulk or hard to find calibers. But you should not be buying ammo at a gun show now. However, $18-$20 is pushing the limit of an acceptable price. Of all the calibers, 9mm is the most international caliber. There are still many places online to sell 9mm in decent prices if you don't mind over seas manufacturers or buying in bulk. If you do mind that, then you're missing out on the main advantages of having a 9mm.