Been using one made by Peak for quite a while, also supplied to several customers with no probs.
Cost me about £25.00 smackers each so not bad value.
Pick mine up from Computer shows so can't help as regards a normal retail purchase. Probably dearer but not certain.
They do have a Web site with updates Ect.
One Wan and 4 Lans on Ntl 800k B/Band.