Most of the budget power cords ( at least in my experience ) won't get you too far. The best bang for the buck is going to be the Belden made Volex line. These are heavier gauge ( better for amps especially ) and offer one layer of foil shielding. Best thing about them is that they will set you back somewhere around $10 - $15 apiece. If you do a search on the Cable Asylum, you should find a good source for them.
If you wanna get "funky" with these cords, you can always cut off the molded ends and put some higher grade connectors on them. This would give you the equivalent of a more expensive cord at probably way less than 50% of retail.
If looking for used cords on a budget, look for the Tiffany's, Kimber's, etc... These are both good cords for what they show up for on the used market. Sean
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