The items available in WoT are artifacts from the Age of Legends. Since they cannot be manufactured in the present day (yet), there are no costs listed for creating a new item. It would be very rare to unheard of for a starting character to have any of these items.
Once the a'dam is on, the women using it can feel each other's emotions to some extent, but only at a very high level (pleasure, pain, fear, etc.) The collar can also be used by the controller to send pain to the wearer (between 1 point and 2d damage, selectable by the controller, which if the optional stun rules are used, will be only stun damage).
A man who can channel touches the a'dam will receive 1d damage per turn until he puts it down. A man who attempts to control a woman with the a'dam (where both can channel) will take 2d damage (non-stun if the optional stun rules are used) per turn and so will the woman.
The woman wearing the a'dam will not be able to take the a'dam off, and will suffer 1 point of damage for each turn she tries. If given a direct order by the control of the a'dam, she will have to obey, or suffer nausea and pain (1 point per turn).
There are also sa'angreal (very powerful angreal, same mechanics) and ter'angreal which are generic magical devices. The ter'angreal often are oddly shaped devices of nearly indestructible material which have some trigger condition (sometimes use of the Power, sometimes mundane).
This ter'angreal is even more rare than most, in that it is capable of drawing from both saidin and saidar. It requires a flow of Air to power it, and the more Air the more powerful the effect. In game terms, the Bowl is able to produce the effect of 1 power in each of the 5 aspects from both saidin and saidar for every 1 power in Air that is channeled into it. So if 20 power were channeled in, it would produce 20 of each aspect from saidin and 20 of each aspect from saidar.
[Is this enough to simulate the effect that the Bowl had? It could be argued that the Bowl did not have to do much to the weather, as the Dark One was only able to affect the weather as much as he did because he was unopposed.]