Not a bunch available now, in fact, i think they have become quite rare.
Only the powerleap ip3/t and upgradeware slot-T adapters have tualatin support as far as i know, all other slotkets are for Celeron only (most common) or coppermine cpu's.
The powerleap can be used on any 440bx board, the upgradeware requires a motherboard that can supply the low voltage of a tualatin as it doesn't have it's own voltage regulator chip.
Coppermine slotket's can be modded. there are some guides for this online and i tried it with an Iwill slocket II and it works fine. But also with this you need to have a board that can supply the right (low) voltage. I don't know if the mod is as stable as the powerleap/upgradeware.
There is also a modded cpu for sale from korea on Ebay, many use these without any issues and is modded very professionally. This can be used in a Coppermine ready slotket and should work fine.
Most but not all P3b-f boards have the right voltage regulator. Look at the voltage regulator:
Chips that can provide voltages down to 1.3V:
HIP6019BCB
HIP6020ACB
HIP6004CB
HIP6004BCB
US3007CW
Chips that can only provide voltages down to 1.8V:
HIP6019CB
HIP6004ACB
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asus a7n8x DL, barton cpu, 6800ultra, Voodoo3 pci, audigy1