Feel free to use a PC power supply, i hear those work but as mentioned, noisy. Not a huge prob for me cause im not after being perfect the first time.
If you want to consider a purpose built one, may i suggest giving the below thread a read?
Sam has made a good video showing this thing being built, and many here love it (me too). I included links to Tayda for the BOM, which is a store that usually has pretty low cost parts.