Is there a guaranteed buyer or mandi for Safed Musli before I plant it?

Be very careful here. Safed Musli has a genuine market with Ayurvedic and nutraceutical firms, but it is also one of the most mis-sold buyback crops in India. There is no government mandi and no fixed price. Many farmers were sold costly planting tubers on a buyback promise, then the buyer vanished or rejected the produce on quality grounds. Rule for you: do not buy planting material from the same person promising buyback. Get the buyer name, the price per kg of dry peeled musli, the moisture and recovery standards, and the quantity they will lift, all in writing on a stamped agreement before you plant. Then independently call two or three processors or traders in Tikamgarh, Chhindwara or near pharma hubs and confirm they are actually buying this season. Dry peeled musli can fetch a wide range depending on quality and year, so treat any high number quoted to you as unverified until you confirm it yourself.