Keep an eye out for their specials of the day.

I've been using these for months, and thought this was a bit dodgy (for anyone thats gone into a temp or tandy etc and got the "manager special of the month" walkman will know what I'm on about), but they're excellent.

Haven't been on it recently, but they did have 256MB SDRam for 65-70 pounds. software-warehouse.com / jungle.com's the other one I use.