Welcome to the forum:flower:
I ordered that same 10 spindle in example #1 from U-Japan one month ago for $39.90/shipped. They raised their price to $99.00/shipped a couple weeks ago. Apparently they believe that people may be willing to spend that much for a Taiyo Yuden BD-R DL. I more recently bought from jp-gift and they are the same discs. All the links you provided are the same model # as the discs I received. I don't know if the sellers are simply trying to make more money with them or if their distributor raised their prices.
The discs I've burned have been very good so far, and another member here has purchased some and will be adding his results soon I believe. These are burning better for me than the JVC or TDK branded TDKBLDRFB I've tried recently. Haven't had good consistency with Verbatim BD-R DL's. Hopefully these Taiyo Yuden will prove to be as consistently good as those I've used, we shall see. Having Taiyo Yuden behind them certainly makes one want to believe they will keep a good quality.
In short, ignore the price differences. Get them as cheaply as you can.
I do not have experience with the LTH That's 25GB BD-R.