changingagain no idea about the craft subscriptions but just wondering if you live near a scrap store?
I live in Milton Keynes where they have a fab one (I know there are some MK folk on here) but there are lots of them scattered across the country.
My local one you pay £10/year to join and then craft supplies are really cheap. They have some stuff that is brand new but if you're a member you get a discount and the prices are pretty cheap when compared to places like hobbycraft or WHSmiths or the supermarkets. But they also collect stuff from local businesses that would otherwise be thrown away but that can be used again and they sell them on really reasonably. So there are things like wooden round discs (from a manufacturer that cuts holes in wood for their product) that are about 8 inches in diameter for 20p each or 10 sheets of A0 silver or gold card that have just a sliver of white showing down the edge for a pound (would cost a couple of pounds each in an art supplier) or massive rolls of paper for £2 that are from a publisher - the rolls aren't economical to feed through the machines but are amazing for kids to draw on and create stuff with.
Obviously every time you go there are different things depending on what they have been given and swapped with other scrap stores. But it's all so amazingly cheap. I once bought a trolley load of stuff including enough felt fabric to make 3 minion scarecrows that were all well over a metre tall, stuff to make and waterproof a couple of massive posters for the school fete, plus loads of craft stuff for the summer holidays and it cost me less than a tenner.
The DC love going there and they can find all sorts of things to make stuff - both the scrap stuff and 'proper' craft stuff. They also put their own kits of things to do together or can suggest stuff.
If you lived close to one you could join up and decide to go every month or two. You could decide to spend a tenner or a fiver or whatever and you'd get a load of fantastic supplies to make some great projects of your own choosing, you'd be supporting a local charity and it would cost you a lot less than signing up to the craft boxes (which seemed pretty expensive for what they were looking at the gift subscription prices and previous projects).