Good manufacturers to look out for include Bauhaus Walstein, Elkhart, Trevor James, John Packer. If you have a bigger budget you could try Yamaha, Yanagisawa and others, but it may help to do some research online before diving in. Do also consider
www.preloved.co.uk if you are in UK as there are several saxes available that are hardly used by people that have not really gone on to play sax - perhaps given up in their teens etc.
What is your budget? There are various options for good value deals apart from ebay, but if you want any impartial advice on particular saxes that you are considering please mention them specifically on the forum.
I have bought many things on ebay very successfully but you do need to know your stuff in my opinion.
Kind regards
Tom
You should be able to get a reasonable set up for under £400, including, say, a Yamaha or Rico tenor mouthpiece.