Perhaps better questions In relation to the target price in Grand Game would be as follows...
-What is the lowest value used? ($1.09, seen on the November 10, 1980 episode, is the lowest I have found thus far.)
-When did it cease ending in numbers other than 5 or 0? (A $1.33 value was utilized on the January 20, 1986 episode, thereby limiting this change to no earlier than the second half of Season 14.)
-When did it switch to solely ending in .00 or .50? (One of $2.10 was utilized on the April 23, 1990 episode, thereby limiting this change to no earlier than the last portion of Season 18.)
To that point, does anyone know if a Grand Game target price that was larger than $9.99?
Indeed there were, and at least three times it was very very much higher than $9.99 -- the Doug Davidson series, which utilized small prizes rather than grocery products, had target prices which included $60, $120, and $125. In these instances, cents were not included on the target price display nor in the values of the small prizes.