Welcome to BLF Marcy!
As much as I Iove those hosts, too, I have a few drop-ins that aren’t used. I have a number of hosts that I upgrade the driver and LED and you may wind up doing the same. One great design feature for a number of hosts is that the LED shelf is integrated and that provides much better heat transfer. You’ll find many projects that forum members have shared here. Good host hunting!
Kaidomain make their own P60 hosts too, but they’re not as cheap. Available in either 18650 or 21700 size. They’re at the bottom of that previous Kaidomain P60 search link. They’re very well made.
I have picked up a few of the KD hosts. They are good, especially for the price. Switch is OK even for the XHP50 drop-in I use with one. The glass is coated. Build quality is adequate. If you buy a drop-in, you can add the host to the order for about $8
Not a 502b, but maybe something to consider. And they do not include a P60, unless you order it in addition.