There's a few places I go for this:
- which definitely seems to be the most widely used one.
- excellent site for general gameplay articles and video as well.
However, today I did some hunting around on the itunes app store, and just downloaded 2 new MTG iPhone apps.
Both of them appear to be usefull, but one is clearly MUCH better than the other. They're a little over a dollar each to download.
- this one is OK.
- This app is excellent. It basically draws all of its data from what value sales are going up on E-bay. Not only does it give you a price, but it also shows the average, the high, the low, and the standard deviation in price. Very handy.
Having an iPhone/internet enabled phone these days certainly makes trading a LOT easier. Simply look up the prices as you're making the decision and you should pretty much always get a reasonably fair trade.