I say do it on your own. The cost isn't even that great these days. You can find godaddy coupons with .com and privacy for $4, no name internet do 10 accounts for $20.
So for $60 you could have 10 domains with privacy and 10 accounts ready to go. The only other cost would be expired domain cost, there's loads of sellers on the, and the cost of content. If you are building pbns then it's never a bad idea to just use the co tent that was there before, scraping it from archive.org