good old fashioned coloured plastic strip fly screens

hi everyone can anyone tell me where they would still sell good old fashioned coloured plastic fly screens to put on the annexe entrance doorway or caravan door as the kids leave them open a lot
doing a 1/2 lap recently one night we had thousands of visitors in the van as the lights inside the van where left on to attract them

no one seems to have them i was thinking of trying some Asian general stores in Richmond victoria sell everything bar the kitchen sink

any ideas? thanks