There isn't anything in my personal collection that couldn't be made at the same price points (most likely less costly) than what we have seen and what is planned by Museum Replicas AS LONG AS it could be done in a production environment.
However, there's one little thing that people like MR has to factor in that none of the various garage kit makers have to and that's licensing fees. Anything officially licensed will have the cost of the licensing fee factored into the price which means that even if MR could make their stuff as good as yours and for the same cost it would still cost more because they still have to recoup the cost of the licensing fee. Considering that the market for high end replica props & costumes isn't all that large and figuring that licensing fees aren't exactly cheap means that they'll have to factor in a larger percentage of the licensing fee into their prices in order to make up for the lower volume of product. However, this does not excuse the sometimes exorbitant prices that that these companies sometimes charge; the officially licensed (Stargate) zat sold by Lightspeed and later Stargate Props is a perfect example of this. You could get fan made ones for maybe $50 - $75 on the average while the licensed ones would set you back about $300 or so easy and they're no better than most fan made ones and were non-working hunks of resin too; talk about overpriced.