There was only one printing.
I find THE BUK-PURDY letters a good read. But- I was always a letters reader.The book is scarce, but you aren't missing much.
I paid $35 for the book. As far as I know they are around $50 on ebay.If you find it, don't pay top dollar for a reading copy. You should be able to pick up a "non-collectible grade" copy on eBay for $25 - $30 if you're patient.
I got a very nice copy from our own Bill R. for $35.