Just got our 10 day tix last week from Ticketmania. They said it would be 8-12 business days for shipping, ours came on day 9. The tickets themselves were in business sized envelope marked "PARK TICKETS" or something to that effect inside of the Priority Mail envelope. They even included copies of the backs of the tickets. (of course I didn't see that until after I made copies)
The brochures they included were nice to look through too, even though they all had the same stuff in them.
We would use them again in a heartbeat!
Wanted to also add that they are listed with the Better Business Berau, and they have a satisfactory rating. They have been listed for I think it was 4 years, without a complaint.