The RRP #7 is much nicer, and you can find practically mint raw copies of those anytime. There's one on eBay now for $56.00, but I've seen them much cheaper. Just keep an eye out for one. They come around quite often for around $25.00. Foil lettering, and sketch background. The regular ones are a dime a dozen. All my RRP and foil covers came from eBay, and all are mint except one (bummer). Modern books should be since they're not that old, and the paper quality is top notch. You just have to ask the seller the right questions before buying. Make sure they know what you're looking for.
I was eyeballing that Dave Stevens Sheena 3-D, but auction ended while I was out.