I don't know if any of you are planning on doing OOT mugs, but I just bought these off Amazon.
They are onsale for $6.76 from $12 and if you buy 3 you get 1 free. I was able to get 12 mugs for $60 with free shipping. I'm going to print out my wedding logo and people's names and insert them into the mugs.
Since we only have 12 people coming to the wedding I was having a hard time finding a company that would do custom printing for small orders. I think these will work great instead!