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Ah. I thought you meant railway sleepers. They are probably 5 x the price though.
Fixing them to the ground is easy - you just need a drill with a big boring bit, some lengths of rebar and a mallet.
Aroogah-
Reclaimed railway sleepers are often similar prices, and tend to be slathered in creosote, which is not always desirable. Creosote is also a right bastard to remove.
I'm keen to convert my allotment to a raised bed model, and these guys have a wide range of sleepers and sleeper-style lumber:
http://www.uksleepers.co.uk/product-catalogue/Railway_Sleepers -
Nope, I'm currently paying £21 + VAT for reclaimed sleepers and they are considerably larger than new 'sleepers' (2.6m x 25cm x 15 cm). I prefer to bed the bottom sleeper on a couple of inches of wet concrete.
Anyway, here's one we made earlier.....
General_Strike
Colin_the_Bald
Got them from Wickes, they are 4 for the price of 3 at the moment
http://www.wickes.co.uk/Products/Gardens/Garden-Decor/Garden-Sleepers+Raised-Bed-Kits/c/1000733