Around 50 dollars...well, if you want a new parts...that won't support you enough. I bought just Connectors from AMP Tyco costed me around 50 dollars...and these are just connectors.
What I will do with 50 dollars in your case is that buying some used parts...from ebay ...like broken printers, modems, motherboards, radios or anything. and use the parts that are built in. <it is not hard at all>
In fact you can do alot with your innovative skill.