Keep in mind, captured ball ends are not perfect.
They do not allow as much freedom of movement. The often don't won't work at as extreme angles as ball cup.
They tend to bind up more than ball cups and will cause added drag and bind in the suspension.
They also should not be used on cars that use a verticle ball stud to adjust roll center (Losi front, B4/T4 etc.) and on the steering tie rods without some careful adjustments. Because they are not the same height as the stock ball cup, you will need to adjust your shimming to keep the same susspension geometry. You can also run into problems where the limited travel of the ball end stops the travel of the suspension before it fully compressed. Using them on steering can cause bump steer issues that are hard to get rid of.
If you want to use them, many guys around here use the Traxxas captured ends. You can get a bulk bag of 12 of them for $6. They are made of a little softer plastic than others but they don't tend to bind and at the price, you can afford to replace them more often if they bend or stetch. Usually you will have to use a slightly longer tie rod with them though because they are shorter than the Losi or AE ball cups.