Hey SLIW, If you buy double the amount @ 6c ; your average cost would be 8c. (Example 10,000 x 12c = $1200 plus 20,000 x 6c = $1200 ; therefore total cost is $2400 ; therefore average cost is $2400 divided by 30,000 = 8c)
If the cost is going to be too much, buy options at 3c!
(In this example buy 20,000 options at 3c = $6000 and pay the remaining 3c x 20,000 just before 29/06/2010)