I'm not sure if you're in the United States, but I this site is fabulous. I bought my Devoucoux from her and it was the totally hassle-free and she's very nice and reliable. She will also be able to give you advice about a saddle that might suit you. Fine Used Saddles | Best French, German, & English Saddles for Sale | Current Availability
With your budget you could probably fine a very nice used saddle in basically any brand if you shop around a little, though I highly recommend a Devoucoux Biarritz or an Antares.