Kind of out of the mainstream here, but I thought I'd share. Artscow (a Hong Kong based print on demand company) has a coupon code available now that allows you to get three custom ink-stamps for $10, including shipping.
I've ordered t-shirts, photo books and custom playing cards from them before, but I was intrigued by the stamps because there are a number of HPotter logos and photoshopped stamps that I thought would be cool to have as an actual stamp. I made one of the Hogwarts crest, one of the Dark Mark and another one from Barneyrfd's Library stamp, complete with purple ink. I wanted to do one of the Ministry of magic stamps that are on the ID cards and such, but the only one I have is the 'sunburst' which seems to have too much fine detail for the physical stamp.
I have no idea how well these will come out and, because of the way artscow works, it's going to take 3-4 weeks on a slow boat before I get my items, but I just thought I'd share in case anybody was interested. The page of 3 for $10 items is here:
photo mixandmatch @ ArtsCow.com - Photo Gifts for Easter, Holiday Gifts Ideas | ArtsCow and you have to use a code during checkout of: MIXANDMATCH3 to get the free shipping and discount.
NOTE: I have no association with artscow beyond being an occasional customer. If there's any issue with me posting the link and coupon code, I'll happily remove it.