Hi T.
As far as specific quick/on-the-go convenience foods go...Costco has dried Fuji apple/Asian pear slices that come in a large box by all of their other snack foods. They are fantastic for babies---crunchy at first but quickly disintegrate---and the baby gets to eat right out of a package (like a big kid)instead of having it cut up. They are as sweet as a desert but only about 45 calories per bag. Also, Trader Joes has great little 12-Grain crackers.
At this age, the sky is the limit (except for obvious high-allergen foods). See what your son likes by letting him try everything, and then pick/choose which ones travel well. Try choices that are as pure as possible with the least amount of additives. Here's some very basic ideas that I've used and I'm sure you've already thought of...
Protein ideas: leftover scrambled eggs from fridge, cut up leftover chicken nuggets, small pieces of cheese, lightly salted garbanzo beans (my daughter likes vinaigrette on them), peas (they have a little protein), leftover taco meat, lunch meat from Whole Foods or Trader Joes (these are nitite/nitrate free so they only last a few days).
Veggie ideas (frozen are so easy/have a ton of nutrients): cooked/lightly sea-salted spinach, peas, cut green beans. Fresh carrots that have been cut up/seasoned/roasted, fresh broccoli that has been cooked (frozen is tasteless, garbanzo beans (again)
Carbs: bite-size-shape pastas (ie Fusili) with olive oil and a little sea salt is my daughter's favorite warm or cold and travels well. Also, Trader Joes has a great variety of tortillas (plain, whole wheat, spinach, tomato-basil, etc.) that are made with minimal ingredients and can easily be cut/torn up, crackers, multigrain pancakes (add babnanas or berries and you've got a complete meal) or waffles, and--of course---cereal
Give everything a try...your son may surprise you. By the way, I sometimes have to force things into my 13 month old's mouth against her will just to get her to get a taste of something first before she will decide she likes it. Other times I just have to put it down on her tray and walk away so she feels empowered to try something herself. Babies can be quirky. Just because they don't like something the first time doesn't mean they won't like it the next day/week.
Good luck!