I'd not buy from ebay as there are too many fake/dubious parts on sale there. Maplin's are ok but expensive and only stock two of any semiconductors at a time and their online catalogue is a joke. lots of errors. R.S are very good but slow in supply, Cpc/Farnell often deliver the next working day.
Last month at different times, I ordered over 300 items from Cpc/farnell, all arrived very promptly.
The 20 or so parts from R.S all arrived ok, some took 3 working days to arrive but the majority took 5 or more.