Ah you're not to first to ask this! It seems to have popped up a few times on the website and this term is only used in Australia and NZ! An op shop (opportunity shop) is a charity shop selling second-hand things.
I imagine the majority of residents on this bus trip were ambulant and did not require wheelchairs.
That sounds great,im going to put that on our programme,thankyou.We go to our local shopping center, they do some shopping,put on laybys,and have lunch ,which they have around ten choices of meals, they love it. Debi