I used TicketMania and was pleased with the transaction. I got the two extra "plusses", free shipping, and no taxes (unless they were included in the price to start with).
I bought two adult and two children's tickets (five day hoppers with four plus visits) for exactly $900. Expensive, but a better deal than I found elsewhere.
I ordered them on a Sunday night, and they arrived the following Monday (one week turn-around). They included quite a few coupon books, maps, etc. for Orlando that would be very useful if you're staying off-site.