OK< well then you can disregard my above , as that was giving thinking you wanted to use actual hay bales to make a blind
NOW< as for commercial built blinds, there are a lot of company's making them these days, , best advice is go look at some and look at the build quality
some are made WAY better than others, but there NOT cheap
another option is to just make your own, can be made on wheels or skids, so it can be moved when needed
another great blind option is , get a old hay wagon and build one on top of that, gets you better viewing, and very easy to move about!
as for deer caring if it LOOKS like a hay bale or not, I don;t think they care, all that matters is giving it some time to sit and them to get used to it, and then, a HUGE part of things is getting in and out of it without deer knowing your in it!
deer are smart they see you get in and out a few times, they will avoid things!