I have bought 6 of these .....all from various vendors at PC schows in the
last year.
They are all for IDE drives, do not have fans, are made of plastic, they
are generic no name vendor.....I paid $14 each and have never had a
failure. The only problem I had was installing them in Enlight cases which
have the quick removel  5.25 inch drive slots. The removable bays need a
stationary rigid assembly  so you need to do some customizing to get them
to work in a Enlight case.
mark
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>I've been having lots of problems lately with these.  I buy them at the
>local computer show and I have about a 50% failure rate on them.
>
>Does anyone have a good make/model they buy?  How much do you pay?  I pay
>about US$20/ea.
>
>Thanks,
>Clyde Lerner