I bought one of these on ebay, the handle is very sturdy but I think the key to this is the blades. They seem to be much better and sharper than anything I have ever gotten in a model shop. Not bad for € 10 for a handle and ten blades
http://www.ebay.ie/itm/310392956414?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
http://www.ebay.ie/itm/310363218803?var=610046047936&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649