Cockerpoos are not easy, simple dogs like people think...they are boisterous and need a lot of training.
They need a lot of time with their owner and constant stimulation - toys, training etc.
Do you truly have the time for this?
Your kids will unlikely be walking pup unless you have got the training to a tea because they will push the boundaries.
Pup will be expensive, you need insurance, constant commitment and will constantly have to buy extras for them.
You say you have no money...can you afford the extra £40 per month for food?
The cost for chews, toys, training classes, yearly vaccines, to have pup neutered, cost for a good harness and lead, bedding, grooming will all add up....and that's not taking into account illness or injury.
As others say it's better to lose £150 than realise once you have pup that you cannot give them what they need.
I also wondered if you're on a tight budget what you will do when dog needs something, but your little one also has a need....who misses out?