Ande also makes a fluro which is cheaper than Seaguar.
Ande = $27 for 50 yards
Seaguar = $20 for 25 yards
Ande Fluro
Ande also makes 50 yd skeins of mono leader material for $4.50
Ande Mono Leader Material in 50yd Skiens
Its nice to have in the plastic holders as you can bring it along in case you don't have enough leaders tied up in advance.