I know there are a bunch of threads out there of building your own etcher for $50 or so and those are great if you can gather all the supplies, there are also threads out there using a simple power supply for a computer for an etcher, while these are easy and inexpensive they offer a limited dc source only.
http://www.testequipmentdepot.com/elenco/power-supplies/xp720.htm
Here is a dc/ac power supply with a 1.5-30 (current limited) volt dc supply and a 6.3 or 12.6 ac source. You can get the power supply fully assembled for about a third of some of the etchers out there or you could get the kit and with a couple hours of assembly and soldering have an etcher for about $60 after shipping.
I'm not saying that it's the best etcher and I am not saying its the cheapest etcher but what I am saying is that it's cheaper than the best and better than the cheapest.
http://www.testequipmentdepot.com/elenco/power-supplies/xp720.htm
Here is a dc/ac power supply with a 1.5-30 (current limited) volt dc supply and a 6.3 or 12.6 ac source. You can get the power supply fully assembled for about a third of some of the etchers out there or you could get the kit and with a couple hours of assembly and soldering have an etcher for about $60 after shipping.
I'm not saying that it's the best etcher and I am not saying its the cheapest etcher but what I am saying is that it's cheaper than the best and better than the cheapest.