Verdict: Strong value—€390 is well below market.
This asking price sits roughly 60% below the median of €995 for comparable used Audium speakers in the current EUR market, and significantly undercuts even the 25th percentile floor of €693. That's genuinely unusual territory. The Comp 3 is a competent compact monitor with a respectable reputation in mid-fi circles, so either the seller is motivated to move quickly or there's something about condition or completeness driving the discount. Without the original stands, you're losing some rigidity in the signal path—not fatal, but worth factoring into your setup cost. At this price, you're buying opportunity, not risk.
Before committing, confirm the driver condition (tweeters for crackling or cone damage, woofers for surround rot—both common on older Audiums), verify the crossover hasn't been recapped or modified, and ask whether the binding posts are original and tight. Request photos of the rear panel and internal bracing. Clarify what "without stands" actually means: are the mounting plates still there? If you need to source aftermarket stands or isolation platforms, factor another €80–150 into your true cost. Confirm they power on cleanly with no hum or intermittent channel issues.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.