Having children can be expensive, so when parents save some money we probably get a bit more excited than most.
But it seems Sarah Burns' discovery of cheaper rail fares for kids is news to most families. And she only came across it by chance herself.
With a broken machine at Woodley station in Stockport, she was forced to pay on the train itself.
And it was once on board that the conductor informed her she could get a return child's ticket for just 80 pence - a big saving on the £2.85 she would have paid had the machine been working.
After tweeting Northern and Transport for Greater Manchester (TfGM) to ask them for more details about the 'accompanied child' ticket, she was told these can only be bought at ticket offices, or on trains themselves.
Sarah, who lives with her family in Woodley, told the M.E.N's Manchester Family : "I'd usually buy from the ticket machine, but the machine was broken yesterday so I had to buy on board.
"I've got the train loads with the kids and never been told about the accompanied child fare until yesterday."
Tweeting Northern, Sarah, who runs her own home education blog Let Them Be Small , said: "Today I had to buy train tickets on train as tkt machine at station not working. Guard told me I could have an accompanied child ticket for D. Reducing cost from £2.85 to 80p. Why have I never been told this before and how do I buy this from machine?"
She then added: "If I can buy this regularly I'll use the train much more often."
Sarah, whose children are six, five and two, shared the discovery on her Facebook page and received dozens of comments from people who were also unaware that the 'accompanied child' ticket existed.
Responding to Sarah's tweet, Northern said: "I do not believe that these tickets can be purchased using a machine, they would need to be purchased from staff in a ticket office or on the train. Very sorry for the inconvenience."
The TfGM website gives details of the fares here - although it gives prices as 70p single and £1.40 return.
Anyone aged 16 or over can buy accompanied child fare tickets for up to four children, aged between five and 15, they are travelling with.
They can be bought for most train journeys outside peak times, but they can't be bought if an adult is using a Rail Ranger, DaySaver ticket, or a free travel pass. Under fives travel free at all times.
