avant garde

Looking for an alternative to Avant Garde Gothic

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Hi There,
I'm looking for an alternative to Avant Garde Gothic Book to be used on an app. The license is $2000-4000 for the server/app usages which is too steep for us. I've tried whatthefont and a few other places but don't seem to be able to find anything close.

Could anyone suggest some alternatives which are less expensive or free?

Thanks very much indeed!

A