Just bought a TomTom GO 530 from totalpda for £137.99 with delivery. I used voucher code attached to get free delivery worth £9.95.
I think this is a good price, aright its a refurbished product, but you will get this new from reviews and past experience and 12 month warranty. Bargain.
Dont forget 4.5% quidco brining it down to £131.78