Proac SM100 speaker stand?

Since you're in Europe, have you considered Wharfedale ST-3 speaker stands?

All the best,
Nonoise

Ok so these are apparently the ones made in co-operation with Proac: https://www.atacama-audio.co.uk/p/hms-2x-speaker-stands-600mm-23-6-supplied-as-a-pair?pp=24#

Their price is also decent of about 300 Euro but filling them up with the recommended material is like 400 Euro.... 😱

Couldn't I just take quartz sand?