We have 30 (and counting) stick insect nymphs, which have hatched over the last two months from my son's collection. Available for £1 each, but we can negotiate if you want larger numbers. You will need to bring your own container for collection.
Stick insects have proven to be fascinating pets for us, and pretty low maintenance - a daily spray with water, and refreshing of privet leaves for food every 3 days or so, growing well (now up to about 7cm within eight months). We started with ten last September, and six have made it to maturity to be able to lay eggs.
It is worth having a good terrarium for them.