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You may still find a use for the PaB wall and have fun in the LEGO store, of course, but I wanted to inform you so you wouldn't be disappointed.
I'd suggest starting a thread asking if anyone has built up the modular sets piecemeal as opposed to buying the set, and see if there are some that have that can offer advice. I spoke to @georgebjones recently about his effort of building up the Cafe Corner, so maybe he can chime in.
1) The piece count is much more diverse than I would have guessed. There are a couple pieces in large quantities, but a lot of pieces in smaller quantities.
2) The modular buildings (can't speak for Taj or Eiffel) seem to have a couple pieces in rare colors and large quantities, that only come in that set. So those pieces are going to be expensive on bricklink and not available at the PAB wall.
Good luck, though, and have fun. The first visit to a PAB wall is very exciting. If you want to get more bang for your buck, carefully stack the pieces in the PAB cups and you will get more.
If you want to seriously try the modular buildings piecemeal, starting a thread about that is a good idea.
Each container has only one type of piece. The upper (four?) rows are typically repeat pieces, and you can see the color variety, so even if they have the color you're after, it's a crapshoot on what piece it will be.
Bring your inventory list with you, and consider yourself lucky if some are on the wall. But even at that, bricklink prices may be cheaper.
Having seen PAB walls at two different brand stores, the selection is very limited. For instance, I've been hoping to buy 1x1 plates of any sort (e.g. square, round, tile) in any neutral solid color (e.g. light gray, dark gray, tan) and have yet to come across the parts. If you want to MOC something up without particular specifications, the wall has a nice assortment of parts. That is what it is geared for, a kid being able to put together something like a car from their imagination. Online PAB selection is much better, but I think more expensive. And then for rare parts you have Bricklink.