Manufacturers are vigilant about keeping their new club prices consistent across retailers/distributors. They force them to sell at MSRP, and if they get caught deviating, the manufacturer will pull their business. Titleist has pulled completely out of PGA SS for 6+ months before for selling pro V1's below the required price.
If you're looking for a deal, my recommendation would be to buy used. depending on the iron, specs can be adjusted to meet your fit (like lie angle). With a wide enough net and a little patience, you can likely find a match or something very close.
The other strategy that works is wait until the newer models get issued, as the previous then het discounted. That strategy works better for TM, Ping, and Callaway - not so great for Titleists