What's the main purpose? Gaming?
Nowadays it is difficult to find a store carrying a 24" S-PVA/P-MVA monitor because most consumers don't wanna pay that much money.
I was gonna suggest Best Buy, but looking at their website they only have 24" TN monitors. You could try it anyway. They might have the 24" LG L246WP-BN which uses a S-PVA panel. I was in a NYC store that had one. Do not confuse it with the LG W2452T-TF which is a TN panel.
Since Best Buy has rolling advertisements on their LCD displays you will not be able to display specific images on the screen like a black screen which can let you determine if there are any backlight bleeding. But in order to do that test properly, the room must be dark (or low lights) and you eyes needs about 5 - 7 to adjust to that environment. I really doubt BB will turn off the lights for you.
TN panels have a tendency to shift colors and turn pale as you view the images at different angles (up, down, left, right). There are other ways to tell the difference, but it is very difficult to describe it without any visual aid and it would be a rather lengthy post.