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It will be the labor to replace the wheel studs that costs money. A spacer itself is just a flat piece of metal milled to a specific thickness. It doesn't need to be expensive or fancy - just flat. If anyone starts talking about "hubcentric" spacers or super-high-quality alloys or whatever, stop listening.
I meant to include the following in my prior reply: what exact tire sizes are on your car right now? The OE C5 rear tires are too tall for a C4, and that may be what's in back of your car. OTOH, in your pics, the fronts look too short, like someone was going for that 1970s drag racing look. That may be causing part of your gap. Please look on the sidewalls and tell us both tire sizes.
Ill send that info on Saturday. I dont know it off hand as i bought the car a month ago. The car isnt at my place at the moment, i put it in storage as we are going to get a lot of rain tonight. The only info i know is 17"x8.5" front 18" x 9.5" rear.