|  |  | 1 | $24.99
| Free | 1d 05h 11m | |
| | | - | $6.95
| Calculate | 28m | |
| | | - | $2.00
| $3.50 | 23h 36m | |
| | | - | $0.99
| $4.00 | 16h 26m | |
| | |  | $3.00
| Calculate | 1d 01h 30m | |
|
| | | | $3.95
| Calculate | 1d 01h 45m | |
| | | | $3.75
| Calculate | 1d 02h 00m | |
| | | | $4.00
| Calculate | 1d 02h 30m | |
| | | 1 | $0.99
| $4.00 | 22h 01m | |
| | | - | $9.99
| $15.00 | 1d 02h 54m | |
| | | - | $9.99
| $7.00 | 1d 23h 07m | |
| | | - | $7.00
| $5.00 | 2d 04h 57m | |
| | | - | $8.99
| Not specified | 6h 54m | |
| | | - | $5.99
| $3.50 | 2d 12h 17m | |
| | | -
| $39.95
$44.95
| Not specified | 23h 19m | |
| | | -
| $2.50
$8.00
| $8.12 | 3d 09h 47m | |
| | | -
| $18.00
$26.00
| Calculate | 3d 04h 57m | |
| | | - | $9.99
| Calculate | 3d 08h 13m | |
| | | - | $9.99
| $10.50 | 3d 23h 54m | |
| | | - | $9.99
| $10.50 | 3d 23h 51m | |
|  | | - | $0.99
| $3.50 | 4d 06h 54m | |
|
| | | | $24.99
| $12.00 | 4d 23h 33m | |
| | | - | $9.95
| $3.95 | 4d 19h 33m | |
| | | - | $9.95
| $3.95 | 4d 20h 24m | |
| | | - | $9.99
| Calculate | 4d 20h 12m | |
| | | - | $9.95
| $3.95 | 4d 22h 33m | |
| | | - | $9.95
| $3.95 | 5d 08m | |
| | | - | $9.95
| $3.95 | 5d 01h 04m | |
| Leinster, Heinlein, Hoyle, Clarke, Zelazny, Blish +
| | 1 | $2.49
| $3.50 | 5d 04h 46m | |
| | | - | $11.25
| $6.99 | 5d 07h 57m | |
| | | - | $3.99
| $3.63 | 5d 10h 59m | |
| | | - | $3.00
| $3.50 | 5d 06h 59m | |
| | | - | $2.99
| Calculate | 5d 23h 11m | |
| | | - | $4.97
| $4.99 | 6d 06h 31m | |
| | | - | $9.95
| $3.95 | 6d 21h 15m | |
| | | - | $9.95
| $3.95 | 6d 21h 58m | |
| | | - | $9.95
| $3.95 | 6d 22h 25m | |
