also i dont know if you have them up in fife but down here you walk down most outer london high-streets and theres lots of pound shops (well, not everythings a pound, but its those kind of general purpose cheap shops that sell everything) and they usually sell these pop up net cages/baskets with a zip panel for access, theyre perfect for mantids and rearing nymphs and whatnot. i think theyre actualy sold for laundry though. so yeh if you can find the equivalent, theyre very cheap and a good size. although obviously there are net cages made specifically for insects and stuff which are more expensive, the ones in the site above look suitable.
edit: when i started writing my reply, ricks hadnt been posted, so yeh sorry to reiterate the point.