http://www.ebuyer.com/UK/product/45025/rb/22160153974
Ebuyer have the WAP54G
One other thing, are the clients just standard 54g, or any possible expansion of it?
If they have a mode which is faster than 54g, matching the AP up to it would be a good idea.
PS. If all clients are 54g and there is no significant co-channel interference from any 802.11b kit, turning off 802.11b compatibility may improve speed.