Hi jsmith and welcome to Colorado Prospector!
I moved your topic to the "Wanted" section.
I think what you're looking for is "paydirt"? There are a lot of sources for this and of course a lot of poor deals out there for it. I would be leery of eBay offerings in particular unless they guarantee a certain amount of Gold in the "paydirt". Basically, all of it is spiked concentrates or spiked sand. Some are more generous and honest about the Gold amounts than others. i wish I had some personal feedback but I don't know who's ligit now.
Dan & Denise used to sell great paydirt in the Miners Market here but they are not currently listing it. Hopefully some of the members here can share any good or bad recent experiences with online paydirt vendors or any of the Colorado mines that might sell rough or paydirt. I'm not sure if the Phoenix mine in Idaho Springs does or not, they might.