I am one of the people that was involved in the serum vs. Urine ketone testing debate. I tried to take it to think tank and the only one who responded was another board member who pulled some quotes from the original tread. That member left the board so that topic kind of died. There are several other long standing board members that strongly advocate for the urine testing. They are certainly entitled to their position on this issue but it has tended to sort of drown out others who use serum ketone testing.
The cost is an issue. The ketone strips are about two dollars a piece if you buy them in a retail store. You can probably get them about half that price on line. It sounds expensive but if you compare it to the cost of one DKA episode, it doesn't seem so bad. Right now Abbott is the only serum ketone meter on the market available for home use. I am sure as other brands come out, the price will go down. I can try to check with some of the medical supply places to see if there are some commercial or institional meters that do serum ketone levels.