first off, wallets out of package printers come in sets of 8  a lot of
photogs used to build the packages around units of 6 wallets so they would
get two free ones with each unit to use for promotional usage.

used to be kids wanted lots of wallets so you'd price them so that it made
the middle and larger packages more attractive.   now they just scan the
proofs or printsand make their own.

consider the usage of folios, sets of images in a padded folder.  They cost
about ten bucks or so but you sell three enlargements or 8 proofs (and
usually you had to buy a minimum order to buy the folio set.)  it was a good
way to make the proofs (which in far to many volume type studios were
included with the minimum order) have more value, its not just a stack of
paper, buts a put together item with some weight.

I think your prices are too low.  though there are a lot of 35mm shooters
out there now getting into the senior market with dirt cheap prices now.
but how long will it take to retouch and print?

even back in the 80's my 'basic' prints were $50 a unit, 125 for retouched.
a 16x20 was 250 mounted, 350 on canvass, and I didn't offer 11x14s for a
reason that's too long to get into here.

mount your prints, it helps with the frame sales, and gives your images
added value, just the heavier product doubles the perceived value in a
study.   I slide my gift sized images into a black envelope I buy at the
paper zone (dealers of paper stock, and some artsy craftsy supplies etc) and
close with a large gold foil sticker with a celtic knot design.   If they
want a folder I show the folios, oh but they have openings for three images,
( I particularly like the wing folio with an 8x10 middle and two 5x7's on
either side) or five, an 8x10 and four proof size, or the frames.

the portrait industry has been based on neg stock, the professional films
are designed for capturing skin tones, slide films are not.  neg stock gives
you a couple stops of exposure leeway that you can take advantage of while
scanning or photoshopping, slide stock is unforgiving.

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