Yup, really depends if you want PAINT or POWDERCOAT.
Paint will run you typically 700+.
Sandblasting & Powdercoat depends on who you use for the powder. Dependant on if they are doing the same color, or if they have it on hand, it's cheaper. You'll need to call around and see what's the best price you can get for purple gloss as it'll depend solely on the shop.