Implementing wet food for large household

Hi! First time posting.

My household is currently made up of five cats, two kittens, and two dogs. one of the dogs and three of the cats are long-term fosters, as their human companion is deployed long-term.

Everyone eats Taste of the Wild. For all seven cats, they go through 2.5 - 3 (15lb) bags of dry food a month , totalling $75-$90. I portion out their food, and leave it all day. No one is overweight or skinny, they are indoor/outdoor - enclosed, so they are all very active (and young).

I want to incorporate wet food, partially if not completely, into their diets. My concern is price difference... as in if I were to start putting some of that $ towards wet food, would it slow down their consumption of dry? Meaning, if I spent $30 on wet food a month, would that eliminate a bag of food, perhaps? 

Or, if you don't mind sharing, what does feeding wet food exclusively cost you monthly, per cat? If switching over to wet food can be done for around the same price, I would have no problem doing it. My tractor supply has 4Health, a decent competitor of TOTW - they have grain free 5.5oz for $0.69, or 13 oz chicken and rice for $0.99.

Thanks in advance for your help!

So, I did approximate per calorie calculations, comparing Nature's Variety dry food (which is a higher cost food) and Special Kitty 22 ounce cans of food (the cheapest per ounce I can find, it's also very low carb) the other day.

They essentially cost the same per 30 calories (about 4 cents). Average grown cat needs 150-200 calories a day. My math might be off a penny or two- this wasn't exact, I estimated quite a bit, but basically, feeding wet is much more expensive than dry on average. However, most of what I've read has said the lowest quality wet is nutritionally better than the highest quality dry, and a lot of the expensive wet foods have a lot of grains, veggies, and fruits- which aren't appropriate for cats.

that's a good way to calculate! i know eating isn't an exact science so it's hard : ).  is there anything, nutritionally, i should be concerned about when it comes to switching over to a lesser quality brand of wet food? byproducts, fiber or protein content, etc. thanks for doing the math for me!

I've used http://catinfo.org/ for a lot of the information (but not exclusively, I've read other opinions, including pro- dry food and anti-byproducts). Her biggest thing is to feed wet and low carb. After that she prefers minimal fish and higher protien foods. She's fairly neutral on byproducts. I personally plan to still feed some dry (right now we're all wet trying to solve an allergy problem) but I do want to be 80-90% wet.

If I had my choice, I'd feed a rotation of wet foods, mostly poultry, with minimal vegetable ingredients. So I'd feed cheap, high byproduct foods and expensive, no byproduct foods, and everything between. I can't afford that, so my cats will be getting byproducts and mystery meat . I'll add in other foods as I can afford it.

I have a budget of $60 per month for my 2 permanent resident cats and they eat an all wet diet. I shoot for the best quality that falls in my price range. I cap it off at $1.20 per 5.5 oz can. I'm not super opposed to feeding Fancy Feast Classics, but I find that I can get even better food than that by shopping around and buying online. For example, large cans of Wellness, cases of food, etc. I also buy food at Tractor Supply Company. (4 Health grain free canned)

My foster cat also eats an all wet diet but she gets inexpensive canned food. Either what's donated or Friskies pates, if I have to buy it. It's better than living in the streets and I figure that what I feed her is probably a drop in the bucket compared to what food choices her forever home makes.