I got in shortly after Beta started, so I have a few that go for a lot of money. I didn't buy in much at the time, unfortunately, but I was a manager in a group that gifted me a lot of packs and cards.

Well you basically just select everything and load the highest prices in peakmonsters and then set it. I should do a video on this sometime.

After you select them all, one of the icons will show a number. Click it and this box will come up. Click rent. The next screen will let you set the prices. You can do it by yourself, or let peakmonsters pick the prices automatically. Then rent them out.