System to 120VAC to 24VDC to 8VDC to 5VDC

I am working on an arduino based project, and need help with a power management system. I have components that draw 24Volts(1amp), 8Volt(8 amps), and 5 volts(2 amps). I'm trying to keep the power management under 50-60 dollars, would it be more advantageous to make the power management system or buy one? What distributors should I use for components?   

In my opinion, It would be more work if you build your own power supply. But on the other hand it would be much cheaper. Having so many variation on the output can be quite bothersome but I believe it can be managed. For the components, I can't suggest much on the supplier. Generally, they are the same for me. Cheers.

Have to agree with Kevin on his first comment. If you roll your own, unless you can buy some demo SMPS boards and set them up for your voltages, you will probably end up with a linear supply.
That is 100VA of transformer, and unless you get a custom one wound, it will probably be two or three individual transformers. Eight amp monolithic linear regulators are not cheap, and a lot of heatsinking will be needed. In both cases, you will have to put a housing around the whole supply, since mains volatges are involved.
You should be able to get some SMPSs, wall warts may do it for everything but the eight amp supply. The voltages you require are all common, the eight volt a little less. It may be possible to mod a SMPS, either 12 or 5 volt, to do the 8.

There are three issues you need to be aware of.
If you need low noise supplies, then SMPS will not be the best choice.
Grounding is critical, particularly since you have an 8 amp supply, only to easy to inject that current into another ground lead.
You may have to sequence the supplies, you don't want to back inject into unpowered circuitry that won't tolerate it.
I think you will find that it is all going to cost a little more than you imagine, whatever you do.
Cheers,
Richard