The quickest, easiest, most reliable mushroom kits we’ve ever seen! With these handy kits you’ll soon be picking delicious fresh mushrooms straight from the windowsill, at a fraction of the cost of buying them at the supermarket. Kits comprise base tray, lid, and pre-spawned substrate. Chestnut Mushroom Kit - Similar to white button mushrooms but tan-coloured and slightly stronger in flavour. Note: carriage charge £4.99.