cliff burton morley power wah boost??
 

I'm trying to figure out where and for how much I can get my hands on one of these pedals, any help?

There are four of them on Ebay right now.

hmmm are there any other sites besides eBay?

Craigslist, Guitar Center used section, or perhaps Vintage specialty stores. This pedal hasn't been manufactured for a very long time.

would you happen to know if they make any types of wah boosts at all anymore?

Morley has a current Power Wah Boost, but it definitely isn't the same. Those old Honkin' huge chrome Tel-Ray Morleys are a really special and unique creature. ;)

man what a shame, thanks for your help!

There are a couple on Craigslist here.
Chrome 70's Morley Wah Pedal
http://toronto.en.craigslist.ca/tor/msg/3601720952.html
Vintage 1970's Tel-Ray Morley Wah Pedal - $225
http://toronto.en.craigslist.ca/tor/msg/3565943711.html
Morley PWB Power Wah
http://toronto.en.craigslist.ca/tor/msg/3622976533.html

Neither of those has the boost you definitely want the power wah boost. I used to have one and I kinda regret selling it because there are no other wahs like it. But the boost circuit really makes the thing awesome and makes it cut through anything.

The third pedal in my post does have the boost but on the other 2 would it be possible to either mod the circuit to add boost or use a pedal to add boost to the signal chain?

Very true, the nothing else quite sounds like old Tel-Ray builds, but they take up so much space, it's ridiculous.