Hey pdogg81,
Welcome to the forum!
The 25GB versions will probably be a lot harder to track down.
But you don’t have to buy a whole stack of 50GB discs just to get the 4 you need for NJVC’S set. I got mine by purchasing only 10 for about $25 at
this ebay listing.
I would recommend that seller based on my own experience. They saved me from having to buy a 25 or 50 pack.
Here is another very affordable listing. Though I haven’t purchased from them before personally, I would assume they would also be a good source.
You still will have a few extra discs, but that will also give you some breathing room in case of burn errors.
Best of luck!