The Westwood Apple Market grocery at 47th and Mission Road (across from Oklahoma Joe's) has pre-made deli sandwiches that are quite good at very reasonable prices. I got roast beef on a nice (probably store-baked) onion roll with provolone for $1.69 today. It made a great lunch. It wasn't enormous, but it was reasonably-sized and satisfying, much more than you'd expect for the price. It's also real deli-quality meat, none of that Carl Buddig crap in the plastic bags you get some places. (cough) . . . (Arby's) . . . (cough)
Other sandwiches ranged from $1.69 to $1.99 and included turkey breast and ham with various cheeses. The case with the sandwiches is in the northeast (left rear) corner of the store, across from the orange juice.
Speaking of Oklahoma Joe's, the trick to beating the gawdawful lines is to call your order in beforehand. You'll go right to the counter and pick up your food, bypassing all the glowering schmucks who've been standing in line for 45 minutes. Their glares will make Joe's sauce taste even sweeter. If the weather's nice, head north on Mission Road about three-quarters of a mile to Rosedale Park for a BBQ picnic.