B.C.
Well, the GOOD news is - you CAN buy the entire series, all 1-62 books.
The BAD news is if you buy them new, it'll cost you $450 (about $7.25 per book).
Back to the GOOD news - you can buy them USED for $185 (which is a much more affordable $2.98 per book).
http://www.amazon.com/Complete-Collection-Books-1-62-Goos...
I like used books and find a lot of them at Alibris.com
It's difficult to find a whole series with a single vendor, and if you buy from multiple vendors, although the book prices might be good, the shipping adds up and starts getting prohibitive.