does a standard normal mouse cost around 40p?

no not if it is alive

most pet shops sell them for about £2.00 each, but since they are social, many will not sell one on its own, so you have to buy at least 2.

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David

my collection:
3.7.0 Leopard Geckos
2.3.1 Crested Geckos
1.1.0 Bearded Dragons
0.1.0 Chinese Water Dragon
2.0.0 Blue Tongued Skinks
1.1.0 Green Anoles
1.1.0 American Green Tree Frogs
0.1.0 Columbian Boa Constrictor
1.0.0 Normal Corn Snake
1.0.0 Amelenistic Corn Snake
0.1.0 Dione's Rat Snake
1.0.0 Everglades Rat Snake
0.1.0 Grey X Everglades Rat Snake
1.0.0 California Kingsnake
0.0.1 Giant African Land Snail
1.0.0 Kestrel
2.0.0 Cats
plus whatever wildlife the orphan season brings!