Something better for the early/high medieval period would be great, if someone could find a place which left us enough of the right kind of sources. Regia Anglorum gives a great collection, but I think many of their prices come from law codes and so on, so they are probably not market prices. If I try to steal your sword while you are swimming and I get caught, the price I and my kin pay may be more about how much I dishonoured you than about how much the swordsmith in the town down the valley charges.
Last time I played around with the Edict of Maximum Prices, I got a suspicion that the prices for staple foods allow for the fact that those vary wildly, whereas prices for durable goods may be more of a 'moderate middle price.' So trying to use the list to get a price in 'liters of wheat', like some economists do, could be a mistake: the wheat prices might not be 'average' but more like 'a fair price after two bad harvests in a row.'