I brought a set of hobby knifes two days ago, I saw them in a 99p store that's in town and thought I would use them just until I buy a proper set.
So obviously it cost me 99p lol by you get the knife with 6 changeable blades so its quite a good deal already but there's more to come, the quality of the blades are really good, they cut through paper perfectly and even can pierce aluminium cans.
To say the least I was shocked as from my experience things from 99p or £1 stores are ok but not great but these prove you an find a good deal if you look :)
The test now is to see how long they last, oh there was only one small letdown and that's it's a bit awkward to change blades but I suppose I need to get used to it, and it didn't come with a case but I wouldn't expect it to for 99p lol