Ok, it's not an exceedingly cheap deal, but it is the cheapest 16 port gigabit switch I've seen, it has jumbo froms support, and it's also got some management functions, like vlans, and flow control.

It's £90 including vat&delivery, from dell:
http://www1.euro.dell.com/content/products/compare.aspx/webmanaged?c=uk&cs=ukbsdt1&l=en&s=bsd

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Mephi
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R5.5
Opteron 2.Ghz
1Gb Ram, 200Gb Maxtor PATA
Avermedia 771 DVB-T
Hauppauge Nova-S2 (waiting to be installed)
MS MCE2 Remote