Bra size:42DD
Binder size:XL
Binder model:Tri-top
Location bought:Underworks
Price:$30 plus shipping
Advantages:Compresses well
Disadvantages:Hard to get on. (Wearing it over a rash guard helps enormously with that problem.) Pinches under arms. Rolls up. Neck line tends to stick out.
Other comments: I don't think it's possible to get my chest completely flat, but this comes darned near close. It's not perfect, but it works well and is good value for money.
BEFORE
Tri-top Over Rash Guard
Tri-Top Under T-shirt Front View
Tri-Top Under T-shirt Side View 
Binder size:XL
Binder model:Compression muscle shirt
Location bought:Underworks
Price:$33 plus shipping
Advantages:Very comfortable. Looks like a regular shirt. Tucks in your tummy as well as your chest.
Disadvantages:Not enough compression for the monsters I'm supporting.
Other comments: I was really sad that this shirt didn't do much for me. It compressed only a little better than my tightest sports bra. Otherwise, I really liked it. Alas, it will be going to Big Brothers as soon as I get around to sending it.
Muscle Shirt in Action
I've also used the good ol' back brace method, which actually works quite well, but is very hot and can be difficult to position in such a way that the ends don't stick out and show under a shirt.
I just ordered a T-Kingdom 1700, so I'll post a review as soon as I get it.