Double pricing..kind of?

Okay, I know this is going to sound...odd. Maybe. I dunno. I can't find anything on this exact issue and I'm thinking it's because I'm looking for the wrong terms. So I'm going to give it a shot and ask. (Feel free to kick me in the teeth if this has already been answered, because I'm sure it has - I just can't find it!)

I'm doing a cart for a deli. I have a mod installed - I can't remember what it's called (I'm sorry - been a long weekend with sick kids) but it places the attributes in a grid so you can say "I want 3 chocolate donuts and 2 plain" kind of thing. (Duh, Products Attributes grid maybe? LOL)

Okay, so here's the thing: I'll use their begals as an example. The bagels with Cream cheese are $2.39 a pop. They have "plain", "sesame" and "everything" bagels. But they also sell them by the dozen - $28.68 per dozen (which, if you divide that by 12, you get them at the same price: 2.39 each).

the thing is, they want BOTH prices to show up. They want people to choose to buy a bagel for $2.39, or to put in a dozen and break up the difference between the boxes in the grid (i.e. 2 plain, 5 everything, 5 sesame). However, when you do that, it charges $28.68 per bagel, so you end up with a $350 order for a dozen bagels. Now, I'm sure the bagels are delicious, but they aren't gold-plated or dusted with diamonds, you know.

Essentially, if you're on the first part of the grid, you can enter in the "2 plain, 5 everything, 5 sesame" and the right price comes out. So they're pretty much just looking to have the same thing, but show it twice.

So I don't know...I'm trying to sort this out and I don't know if ti's brainfreeze or what. Can I have a regular dropdown show up (for when people want to order a single bagel) and then ALSO have a grid for when people want to order a dozen? Or is there some kind of offset I can add to the $28.68 attribute that'll correct the price? I've already recommended just skipping the "dozen" price, but they want it there.

If anyone can point me in the right direction, I'd surely appreciate it.

Thanks!