Good morning!
Yes, they are quite nice, but a little tricky to drill!
The sizes I got (should have gotten more of them!) are 5"- 6" diameter and cost between $.80-.95 each, so pretty cheap. The only issue w/ KK is that if you don't order at least $30. worth of supplies, they tack on a $5 handling charge. So, I just ordered physan and a couple of their mixes as well, and got it up to the $30 mark. You could probably just drive down there though, so that wouldn't apply. I used their paph mix to repot the SS.