We're only slightly better off here in OZ as far as piggy stuff is concerned. You can get the basics but that's about it. At the moment there is only one supplier of C& C grids in Brisbane & they import them from Asia as storage units. Correx? Good luck on finding some. Large ready made cages suitable for indoors? Forget it. I ended up buying the traditional Aussie outdoor 2 storey wood hutch with a wood run attached & used it indoors. The fleecy ramp tunnels & anything else fleecy (cuddle cups, hideys, hammocks, etc) I bought from the UK. Even my local piggy shelters have said all their fleecy items they order from the UK as none available here, so we are forever exchanging info on suppliers we discover. One of the reasons I love this forum is because I can find out where to get fleecy items. And many are made by forum members!
Looking at one of the links posted by a member I discovered a UK pets supply shop that had the traditional indoor cage of plastic bottom tray & wire grids, but it was 1metre x 1 metre & they shipped overseas. I was so excited! Yes, the freight cost me as much as the cage itself, but I am so pleased with it as are my 2 boys.
I had to laugh about your comment on having someone bring it in for you. I lived in Trinidad for 2 years & very little available on the island. So, whenever anyone was going to visit the UK or USA or Canada, their friends would all submit shopping lists! I ended up being both the shopper & shoppe myself at various times.