Soft top surfboards are generally cheaper than the epoxy longboards (which is good news for beginners who will benefit from them the most). They range between $300-$500 for a store-bought one and $600-$1000 for a custom model.
Longboards or surfboards with the hard top (think wood, fiberglass, and foam) are on the more expensive side of the spectrum and are known to cost anywhere between $500-$1500 for a store-bought one and $1500-$2000 for a custom model.