Towbar for 2003 320D

I need a tow bar for my 2003 320D, just for towing a trailer. I have been offered a Witter, but I am told that they need to cut the bumper
to do this and I don't like the sound of it. What do I need to ask for instead, or should I just get a BMW one? Funds are quite tight and the Witter one is quoted at 300, so expect that a BMW one will be at least double. Please help, or if you can fit BMW tow bars at a reasonable price, please let me know. One to fit myself is not an option. Thanks.
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