This Binatone MD3250 Quad Telephone set is on offer at argos for £29.99, available for FREE store collection. If you want delivery, that would be £4.95 extra.
This is a very good price - if your house is one of those where you can never find the bloomin' telephone, then this might be the offer for you. I'll admit that they are a cheap make, so I wouldn't expect these to last a lifetime, but for £29.99, who's complaining!?
Details: 4 handsets, only 1 telephone socket required. Caller display stores information on the last 10 calls (subject to network connection). 20 number memory in handset. Up to 300m range. Up to 7 hours talk time and 72 hours standby. Last 5 number redial. Adjustable volume. 8 ringer melodies. Register up to 6 handsets. Intercom facility. Call transfer.