mn_paddler wrote on May 20^th, 2007 at 5:20pm:

Not to hijack the thread, but the question is related to blue barrels.  My brother moved into an apartment where the previous tenant  left a barrel and lid, but no clamp to lock the lid down.  Anyone know where I could get one and roughly how much.  The barrel is the 30l.  Thanks.

you could try:

30 Litre lever lock closure ring - $10.00 CDN

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scroll down to the bottom of the "packages and parts" page
they say they have locations in both Canada and the USA