I was talking to a retailer of Rossum, and they said, at least when it came to modular stuff, that an order can be placed, but come invoice time prices are subject to change. so prices can go up anytime.
BUT if you pre-order something, paid in full, then you get it for the price you pre-ordered at. a deposit it just a hold, and is subject to the price hike.
I get it…but I dont like it.