First post - Please be gentle!
Crucial 512Mb PC2-5300 (667Mhz) DDR-2 Ram is £14 per stick at Ebuyer (qf 119258)
Order 2 to bring the basket up to £28, then add over £2 worth of filler to make the Google checkout discount valid. If you keep the total weight under 0.5kg (you have 0.4 to play with) you get the cheap delivery (£2.19 + vat on super saver).
Some possible filler items:
6 x Cat Mouse Mats (not sure what you'll do with 6.. presents?) (qf 81832) - brings total to £22.69 with super-saver
or Black USB Optical Minimouse (qf 108272) - brings total to £23.56 with super-saver
Lots of cheap USB and adapter cables at other small things are available for a couple of quid - searching the 'ebuyer extra value' brand for all items is a good idea!
DDR2 Memory is a rock-bottom prices at the moment, this is a great upgrade for people with dual-channel DDR2 boards. Its not a 'matched pair' but Crucial are on of the largest and most reliable memory suppliers, never had any problems with these on either Intel or AMD platforms.
I know theres been a lot of memory and also EbuyerGoogle checkout deals on here recently but they really are worth taking up whilst the offer lasts!
(NB I've ordered several things super-saver and they have taken between 1 and 4 working days to arrive, mostly city-link but they will probably post things under 500g. The memory is well packaged.)
Oh yeah, remember quidco, its almost 5p!