Our PTA (primary school) does an ice cream sale every Friday afternoon for the summer term. Just lollies and Cornettos so they can buy in bulk.
They also use Easyfundraising - it's one of those sites that you 'shop through'. So if you're doing a grocery shop at ASDA you go to the ASDA site via Easyfundraising and the school get a payment in return. Our school's raised over £400 so far and it's easy - you just have to click into that site when you shop.
Our embroidered items of uniform are from the Tesco shop - the school gets a pay back for that too. That's obviously not the PTA but is another income source. And they are cheaper than school uniform shops.
They also apply for the supermarket 'drop a disc' type things where you get disc when you're shopping and drop it into a worthy cause/charity box - usually three causes on show for a month. Most supermarkets have the rule of the highest number of disc tokens get a certain amount and the other two get a split of the charity budget for the store.
I think, for example, with Waitrose, their stores have between £500 and £1000 depending on size to divide between three causes each month. You have to apply to be considered. Our PTA has applied twice to Waitrose and twice to Tesco and have been featured in both stores. That's a lot of cash when your parents just have to drop a token when they shop. And the kids love it - they can see if they are winning!
Our PTA also does a 100 club. I don't know the ins and outs but basically it's a lottery. You pay an amount each year and choose a number for that year. If you're number wins (monthly draws) you get a cash amount. I think ours is a £1 a week (so £52 for the year) with a £40 top prize, then £20, then £10. We have a mega prize at Christmas and the annual fair of £100. I think we've got 60 of the 100 tickets sold this year.
So that's £1040 pay out (12 x the monthly £40, £20 and £10 plus the two £100 mega prizes). It brings in £3120. Our PTA keeps the difference - £2080pa.
You just have to be careful that you've got enough interest to cover your payout and that you get the cheques or direct debits promptly.
All of these plus discos at the end of term and raffles are popular - parents don't have to do anything except drop a token or buy a treat for their kids. They don't have to give up time or arrange baby sitters. It's an easy win for the parents.