They are not giving you anything off ! If you buy anything through M&P ebay it is more than 20% off.
A good example is a RST Rallye 1888 waterproof jacket on M&P website at £159.99 but, through M&P Ebay it is only £77.00
I should keep my mouth shut really because i used to get a engine part from them at trade price for £25.00 but, noticed the same part in there ebay shop to the public at £16.00. After i asked, why is it cheaper for me to order via ebay, they put the price up