I've found a few bargains at GO but their RRP is a bit of a con.
My wife had been looking for a decent outdoor jacket for a while but was even fussier than me when it came to specifications (not so much fabric, hydrostatic head, wired hood etc more along the lines of nice colour, tailored fit and coordinates with her other outdoor clothes colourwise).
We found a North Face jacket which ticket all the boxes but the didn't have it in her size in the store. We decided to order it from their online store but opted to check to see if it was available elsewhere. After a quick search we got it for over £25 quid cheaper from Tiso (a company I've never considered to be famous for bargains, if anything generally more expensive for most gear)
I've since got into the habit at GO if making a purchase of any reasonable amount of doing a scan & search on the barcode using my phone, often with interesting results.