I start the play with a matrix done in sixteen optimized combinations.
The combinations (16):
01 10 25 31 42 49…01 08 23 26 32 40…02 14 16 37 48 49…01 24 35 41 43 46
01 12 14 33 44 49…12 30 36 39 43 47…05 06 21 37 38 45…01 06 09 15 18 24
06 12 18 20 36 49…03 05 11 17 47 49…04 07 10 27 38 42…09 15 18 19 31 39
05 21 22 29 36 47…05 22 28 33 34 47…10 11 12 30 31 42…01 07 09 13 18 45
The final price is $16.
Babar 
The combinations (16):
01 10 25 31 42 49…01 08 23 26 32 40…02 14 16 37 48 49…01 24 35 41 43 46
01 12 14 33 44 49…12 30 36 39 43 47…05 06 21 37 38 45…01 06 09 15 18 24
06 12 18 20 36 49…03 05 11 17 47 49…04 07 10 27 38 42…09 15 18 19 31 39
05 21 22 29 36 47…05 22 28 33 34 47…10 11 12 30 31 42…01 07 09 13 18 45
The final price is $16.

