I see the family picture, but you don't say how old your kids are. Are they willing to split meals? My family of 4 (me, DH, DS10 and DD7) would often get two adult half-rotisserie chicken meals (either from Cosmic Ray's in MK or The Land in EP) and then split them between all four of us. The folks always gave us extra (small) plates when asked. Also, an extra serving of veggies was only $2. We usually got one order of extra veggies with each adult meal we planned to split. The veggies were usually carrots, green beans, or a combo. If we didn't get extra veggies, we got a bowl of chopped fruit to split between the four of us. We bought milk for the kids, got (free) cups of water for us...I think our lunches averaged between $25 and $30 total.
Of course, I have kids who are used to eating Real Food (chicken, green beans, carrots, mashed potatoes...), so this worked well for us. DH has chronic digestive problems and has to limit fried food, so I had to figure out where all he could eat. Oh, a lot of these same places will do a kid's meal of a rotisserie chicken leg with mashed potatoes.
Hope this helps.