Or even cheaper get two NetGear ME102, which are the same hardware as the Linksys WAP11 devices and re-flash them with the Linksys firmware.

In the UK the ME102 is 25% cheaper than the WAP11 (ME102 is 104 quid + VAT at action, cheapest I can find WAP11 for is 140). The ME102 does not have an external antenna socket however.
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Remind me to change my signature to something more interesting someday