As someone who is in retail merchandising, i can tell you it's common practice. MAP is utilized by a lot of companies. Now, I'm in food service, so I can't give many examples outside of my area (other than obvious ones - apple for instance) but brands like red bull, monster energy, coke, Pepsi, etc all use MAP.
It's not there to hurt the consumer, but rather protect them (in a sense). The idea is that no matter where you buy product A at, you're going to pay $199. That way you don't have to worry that a retailer is ripping you off.
Now MAP (did I mention this stands for minimum advertised pricing) doesn't prevent sales and specials. It just means that when a sale happens, it happens for that product from all retailers. Take ecotech radions for example, they were just on sale (maybe still are) everywhere for $100 off the gen 2 and $150 off the pro. Sales still happen, it's just a difference in who controls the price.
An example where you win: let's say you're buying 5 items, you shop around, retailer A has the best deal on the first 2 items, retailer b has the best deal on the 2nd 3 items. If the manufacturers enforced MAP, you could buy from the retailer you liked the best - not who has the best price since they're all the same.
***i laid this out to explain what MAP is and why it is used, this isn't me endorsing its use or condemning it - just explaining. Hope that helps
Tim