I looked into this a little. A few months ago I bought a single solar shingle, they sell samples for just the cost of shipping.
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At the time I think the board itself was free but shipping was $60. I never received it. It was lost in shipping but they were very aggressive in getting me my money back so there's that. It occurred to me later that I got the wrong kind of shingle. I have an asphalt shingle roof. I ordered a solar shingle meant for a slate roof.
After I got the refund the seller contacted me and said they've upgraded their offerings.
They now have one that's made for asphalt shingles but it looks hideous in my opinion.
Furthermore I just can't make the numbers work. It looks like $.9 per watt. That's not even factoring in the cost of shipping from China or the tax situation. It's pretty easy to get quality panels for $.33 per watt. The money I save by not buying shingles doesn't come anywhere near to making up the difference. So going this route actually costs a lot more money.
On top of that I really have to wonder how well these are going to work in ten years. There's no ventilation behind these things.
If you're bending into a higher end type of roof these might make sense. I haven't run those numbers since I don't have a high end roof. But if you look at the way these are installed then the slate style bipv shingles look like they have airflow behind them at least.