Frugal

To be fair, aioli is one of the easiest and cheapest condiments to make yourself, and offers so much room for creativity (if you're into that). You don't have to get a food processor, either. Ignore the food snobs and use a blender. Thank me later.

(Essentially: an egg, garlic, salt, pepper, lemon juice, and a light oil [I prefer olive, but others can work too]. All told, a quart of aioli will run you less than $0.20, and you can't beat the pride that comes from knowing you made it that damn delicious.)