I am designing some PCBs, which I intend to prototype, and then get small volumes produced for personal use at a cheap PCB house such as Itead, DirtyPCBs, or Seeedstudio Fusion PCB. These board houses all charge about $12 for 10 copies of a PCB up to 5x5cm. My design will stick into a USB port like a little dongle, and as such will be much slimmer than 5cm (somewhere between 1 or 2 cm).
When I have purchased multiple PCBs off of eBay or similar, they often come attached with 'V' groove routing and you can just snap one off. Is this something that these cheap PCB houses offer, bearing in mind they probably use it to separate different boards in an order anyways? Or, if not, is there any other kind of routing they offer which would work in this scenario?
Could I arrange my Eagle file so that it had 3 copies of the board with the 'v' routing separating each board, send the relevant files off and then get 10x3 boards back ready to snap apart myself? It seems like bad value for money (although obviously good value overall) when I am paying for 5x5 cm but only using 1x5.