This is my favorite, and pretty standard:
Dynalon SMP10 Melting Point Apparatus with Digital Temperature Sensing and Display, 0 to 300 degree C, 1 degree C Resolution, 1% Accuracy: Amazon.com: Industrial & Scientific@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41oId1nhgwL.@@AMEPARAM@@41oId1nhgwL
This would work, too, and is a lot cheaper:
Melting Point Apparatus Simple: Amazon.com: Industrial & Scientific@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41Jo1cDSnIL.@@AMEPARAM@@41Jo1cDSnIL
Part of the value of a melting point test is to see if there is a very discrete melting point (all the material melts suddenly at one temp) or if there is a broad range of temperature between when it starts melting and all of it is melted. This can tell you a lot about the purity of a sample.
The first, more expensive one, has a magnifying glass and a light inside and holds two glass tubes, one containing your sample and the other containing a control or known compound if you have it. You can watch individual grains of your sample under magnification and the temp goes up slowly by tenths of a degree. It has a digital temp readout.