I know there was someone that posted a while back about stamps.
I finally got mine and I am very pleased with it. Here is the seller from Etsy. I got a self inking stamp in brown ink for $35
this is the actual website but he is also on etsy.
I also discovered how to get the perfect ink shade for the font to adjust on your computer. I came by it online here it is. I haven't tried to the numbers yet since I haven't printed my invites but if you get the chance to try it out before me then let me know if the colors are on point.