I was just in my local Argos store, Hanley in Stoke-on-Trent. They are running the new clip-on iPod shuffles, the silver model, for just £34.99.
Catalogue number 593/3134
This isn't the very latest model, as it comes with the old earphones, but the unit itself is identical to the new silver models being sold elsewhere for £55.
There were 15 left when I did the stock checker just, so if you can get there quickly you should be in luck. I don't know if this is a Hanley only thing, or applies to all stores - no sign of it on the website.
Here's the Argos spiel about the shuffle:
Up to 12 hours playback.
Holds up to 240 songs.
MP3 (8 to 320 Kbps), MP3 VBR, AAC (8 to 320 Kbps), Protected AAC (from iTunes Music Store, M4A, M4B, M4P), Audible (formats 2, 3, and 4) and WAV.
Charge time about 4 hours (2-hour fast charge to 80% capacity).
Minimum PC specification PC with USB port, Windows 2000 with Service Pack 4 or later or Windows XP Home or Professional with Service Pack 2 or later, Requires iTunes 7 or later.
Includes earbud headphones, USB 2.0 cable, dock adaptor.
Skip free playback.
Size (H)8.3, (W)2.48, (D)0.83cm.