all you need is money
I can't think of any, and I have seen and worked on many RR engines.
Millions have been sold!
1
more than your dumdass can pay for one.
how many bale shirts have been sold
millions have been sold
300 Bugatti Vyron's have been sold
they were very popular before, but about 1,000 have been sold.
4567 have been sold so far
"Have been sold" ? If you mean by retailers, that number is incalculable.
1000 copies have been sold