Third party power adaptor for MacBook Pro?

I am about to lose my second power pack due to under-engineered wiring on these Apple power supplies. The wires are very small and thin, and the strain relief at the entrance to the "brick" is totally inadequate, so the wires end up breaking under daily use. I looked at the iGo website, only to find out that there is some sort of licensing issue with Apple that prevents them from selling tips for the magnetic connectors that are in vogue. Kensington apparently doesn't supply any Apple adaptors anymore.
Does anyone know of a third party company that makes a replacement power supply that will hold up under normal usage for more than a year?
Thanks

Hi Justin,
The very first of the square power adaptors (which came with an early white iBook) which we own developed a problem of the kind you mention. Since then we've done one simple thing with all of the many that have followed with a variety of iBooks, PBs, MBs and MBPs, and never lost another.
We simply make a loose loop of the cord around one of the "legs" of the adaptor:
We leave the loop in place both when using the computer and when winding the cord around the legs for transport.
Not what you were asking for, I know, but it has certainly stopped any problems we have had with strain on the cord
Cheers
Rod

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