Protein??? Carbs???

Well done so far first of all!
As for protein snacks here's a few things i use to boost my protein intake
Tuna - 30g of protein in one tin, i personally eat mine with chopped onions, light mayo and a few spices.
Beans - Most types have a lot of protein, but your typical tin of baked beans in sauce will have 15 - 20g of protein in.
Other meats and fish - Pretty self explanatory, chicken breast is always easy and flexible

Of course those aren't the only choices, just the ones i commonly eat.

And if your still having trouble there's always the option of protein powders.

I'm with Fullboost.

You are doing a great job. I have had several "plateaus" as I have lost weight. Try to get to a 40-50% carb and protein ratio. I use protein powders (Good ones with low sugar, no soy, only whey protein) from people like Cyposport/Muscle Milk, EAS and others that have 25-26g of protein per serving. I also find low fat or no fat cheeses and yogurts helpful. I mix in a tiny bit of whole grain low sugar granola in a 1/2 cup of yogurt is a great snack before a workout. Also, black beans are a great source of protein and carbs, as well as other beans and legumes (pintos, lentils, etc.) Chopped nuts like walnuts, almonds and pecans (no salt) in measured quantities are great, too.

Also, you really have to eat enough. Women doing P-90X should be getting 1500 cals a day I think I have read. At any rate no less than 1200. If you skimp on the calories and do intense workouts, you will run a deficit that will make your body store up what you eat. I did 2/3 of Round 1 P-90X thinking I would lose weight faster if I only did 1200 calories a day. It did not work and I stayed at the same weight for two months.

Keep up the good work.

All the best,
Dave

For me the easiest way to up my protein and lower my carbs is to swap a meal or two for a home made protein shake.
I love them, I also only use soya milk in them (and on my cereal), has less carbs and sugar and more protein than regular milk.
I then just try to eat carbs with protein as much as I can, so I try to avoid carbs alone, if I make an effort to eat this way it comes on by it's self.

I use soya protein powder as I have found that it has the least fat, sugar and carbs and best for adding the most protein without all the other stuff.
I also eat nuts instead of crisps or snacky things.
All these little changes have an impact and they all add up.

Good luck with your goals )