You can always make your own Pitas. Pretty easy (250g flour, 160ml water, 2tsp olive oil, 1tsp salt, 7g active dried yeast, and if you want about 20g small seeds - nigella, onion, mustard all work well). A pinch of baking powder helps as well. Make the dough as normal (basically mix it all together adding wet to dry until you have a slightly sticky dough; should stick to your fingers but come off cleanly when rubbed). Knead, rest to double in size (or overnight to add a sour tang), knead and form into balls, roll the balls flat until about 3mm thick. Bake at 250C until golden.
You can make the day before and simply warm through before using on the day. Also means you can still get to the shops if it all goes pear shaped