Hi, I recently bought an NVGS-75 from topelectricals.co.uk, it was delivered promptly and well packaged. But there might be cheaper places for the gs-150.
The GS-150 is the replacement ofr the gs200, I compared these in jessops before I ordered and the differences I saw were:
150: smallest one, hot-shoe, leica lens, 2.3 MPixel stills, cool brushed metal side bit.
200: biggest one, but only just, hot-shoe, leica lens, 2.3 MPixel stills, doesn't look as cool, AV-In, Manual focus ring.
I went for the replacement for the old gs-120, because I didn't need the extra stuff, and price was critical for me.
hope this helps.
Panasonic SD9, Panasonic NVGS-75, Canon MV600i