I used Formica brand that I bought from lowes. As said above, it's 1/16" thick.
It comes rolled up.
Wilsonart also has a similar laminate but I have read somewhere on line that its not as durable as Formica brand but I've never tried it.
Home Depot in my area has 4x8 sheets of wilsonart black laminate in stock.
Just a little tip: if you're doing the laminate inside, I'm told the chemical based adhesives can stink bad. I used water based from 3M, I believe the part number is 30NF. It costs about double as the others ($30 a quart at Graingers) but it works great and a quart will do a whole cabinet.